Unit # 2…….. M.C.Qs on Gaseous State
1. Absolute
zero is defined as:
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(a)
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OK
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(b)
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-273.15°C.
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(c)
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-459.7°F.
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(d)
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All of the above
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2. Boiling
point of water is:
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(a)
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373K
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(b)
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100°C.
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(c)
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212°F.
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(d)
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All of them
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3. Freezing
point of water is:
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(a)
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273K
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(b)
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0°C.
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(c)
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32°F.
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(d)
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All of them
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4. Normal
human body temperature is:
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(a)
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310K
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(b)
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37°C.
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(c)
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98.6°F.
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(d)
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All of them
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5. At
absolute zero temperature, the total kinetic energy of molecules is:
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(a)
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Zero
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(b)
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Maximum
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(c)
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Minimum
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(d)
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Cannot be predicted
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6. A continuous, rapid, zig-zag motion of a suspended
particle through the medium is called:
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(a)
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Mean free path
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(b)
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Elastic collision
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(c)
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Brownian Movement
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(d)
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Effusion
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7. Brownian
movement is one of the most direct evidence for:
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(a)
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Kinetic theory
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(b)
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Gay-Lussac’s law
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(c)
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Charle’s law
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(d)
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Boyle’s law
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8. At
s.t.p. 44.8 liter of any gas weighs equal to:
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(a)
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1 mole
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(b)
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1.5 mole
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(c)
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2 mole
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(d)
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3 mole
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9. The
random motion of a gas molecules form one place to another is called:
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(a)
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Effusion
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(b)
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Osmosis
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(c)
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Diffusion
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(d)
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All of them
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10. The escape of gas molecules through a tiny hole
into an evacuated chamber is called:
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(a)
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Effusion
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(b)
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Osmosis
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(c)
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Diffusion
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(d)
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All of them
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11. The
collision of ideal gas molecules are:
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(a)
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Elastic
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(b)
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Inelastic
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(c)
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Both a and b
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(d)
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None of the above
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12. Which
reduces force of attraction between gas molecules?
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(a)
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High pressure
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(b)
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High temperature
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(c)
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Low temperature
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(d)
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Low pressure
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13. Which
increases force of attraction between gas molecules?
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(a)
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High pressure
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(b)
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High temperature
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(c)
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Low temperature
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(d)
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All of the above
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14. Out of the following four molecules, which
molecule does not possess London forces?
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(a)
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He
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(b)
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Ne
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(c)
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H2
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(d)
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NH3
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15. The three variables of volume, pressure an
temperature can be inter-related in one expression called:
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(a)
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Boyle’s law
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(b)
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Charle’s law
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(c)
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General gas law
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(d)
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Dalton’s law
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16. The total pressure exerted by a mixture of
gases is the sum of the partial pressures of all the gases, is the statement of:
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(a)
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Gay-Lussac’s law
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(b)
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Graham’s law
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(c)
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Avogadro’s law
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(d)
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Dalton’s law
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17. The
respiration process taking place in living things, is an application of:
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(a)
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Gay-Lussac’s law
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(b)
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Graham’s law
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(c)
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Avogadro’s law
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(d)
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Dalton’s law
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18. The
partial pressure of oxygen in air is:
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(a)
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159.6 mm Hg
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(b)
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259.6mm Hg
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(c)
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359.6 mm Hg
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(d)
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None of the above
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19. The
partial pressure of water vapours in gases is called:
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(a)
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Surface tension
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(b)
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Aqueous tension
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(c)
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Atmospheric pressure
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(d)
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None of the above
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20. The volume of reactant and product gases in
a chemical reaction at a given temperature and pressure are in the small whole numbers.
This is the statement of :
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(a)
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Gay-Lussac’s law
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(b)
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Graham’s law
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(c)
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Avogadro’s law
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(d)
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Ideal gas law
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21. The
density of a gas varies directly with:
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(a)
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Temperature
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(b)
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Volume
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(c)
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Pressure
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(d)
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All of the above
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22. The
density of a gas varies inversely with:
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(a)
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Temperature
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(b)
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Molecular weight
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(c)
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Pressure
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(d)
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All of the above
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23. Which
one of the following equation is used to determine the density of a gas?
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(a)
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d = MP/RT
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(b)
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d = RT/ MP
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(c)
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d = MRT
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(d)
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d = RP/MT
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24. Which one of the following equation is used
to determine the molecular weight of a gas if density is given?
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(a)
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M.W. = RTd/P
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(b)
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M.W. = P/ RTd
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(c)
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M.W. = RPd/T
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(d)
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None of the above
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25. The
molecular weight of a gas varies directly with:
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(a)
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Temperature
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(b)
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Volume
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(c)
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Pressure
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(d)
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All of the above
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26. The
molecular weight of a gas varies inversely with:
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(a)
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Temperature
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(b)
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Molecular weight
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(c)
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Pressure
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(d)
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All of the above
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27. The
molecular weight of a gas varies inversely with:
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(a)
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Temperature
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(b)
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Density
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(c)
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Pressure
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(d)
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All of them
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28. Which
is an ideal gas?
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(a)
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CH4
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(b)
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CO
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(c)
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CO2
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(d)
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None of the above
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29. Which
is not a real gas?
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(a)
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H2
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(b)
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O2
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(c)
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He
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(d)
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All of them
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30. A
gas which does not obey the gas laws at all temperatures and pressures is
called:
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(a)
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Perfect gas
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(b)
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Real gas
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(c)
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Noble gas
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(d)
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None of the above
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31. For which type of gases the graph between P
on x-axis and PV/nRT on y-axis would be horizontal line parallel to x-axis?
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(a)
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Ideal gases
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(b)
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Real gases
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(c)
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Noble gases
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(d)
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None of the above
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32. …………….
temperature and ………….. pressure makes the gases non-ideal.
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(a)
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Low, high
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(b)
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High, low
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(c)
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Low, low
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(d)
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High, low
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33. Which
one of the following is more ideal?
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(a)
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Polar gases
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(b)
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Non-polar gases
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(c)
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Real gases
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(d)
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None of the above
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34. Which
one of the following is more non-ideal?
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(a)
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Polar gases
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(b)
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Non-polar gases
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(c)
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Inert gases
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(d)
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None of the above
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35. At high altitude, the pilots may have
uncomfortable breathing in a non-pressurized cabin where oxygen partial pressure is
around:
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(a)
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159.6 mm Hg
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(b)
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150mm Hg
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(c)
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250 mm Hg
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(d)
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100 mm Hg
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36. The attractive forces between molecules of
gases which are operative over very short distances are called:
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(a)
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Dipole-dipole force
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(b)
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van der Waal’s forces
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(c)
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Induced dipole
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(d)
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All of the above
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37. van
der Waal’s forces are:
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(a)
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Permanent forces
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(b)
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Temporary forces
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(c)
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Variable forces
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(d)
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None of the above
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38. The weak short range attractive forces in
non-polar molecules or inert gases due to temporary dipoles is called:
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(a)
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London forces
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(b)
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Hydrogen bonding
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(c)
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Induces forces
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(d)
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None of the above
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39. London
forces are also called:
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(a)
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Dipole-dipole force
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(b)
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van der Waal’s forces
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(c)
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Hydrogen bonding
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(d)
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All of the above
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40. London
forces are effective at:
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(a)
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Low temperature and high pressure.
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(b)
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High temperature and high pressure.
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(c)
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High temperature and low pressure.
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(d)
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Low temperature and low pressure.
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41. Which
of the following will have the same number of molecules at STP?
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(a)
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280 cm3 of CO2 and 280 cm3 of N2O
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(b)
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11.2 dm3 of O2 and 32 g of O2.
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(c)
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44 g of CO2 and 11.2 dm3 of CO.
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(d)
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28 g of N2 and 5.6 dm3 of oxygen.
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42. The
molar volume of CO2 is maximum at:
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(a)
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STP
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(b)
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127ºC and 1 atm
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(c)
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0ºC and 1 atm
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(d)
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273ºC and 2 atm
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43. Pressure remaining constant, at which
temperature the volume of a gas will become twice of what it is at 0ºC:
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(a)
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546ºC
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(b)
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200ºC
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(c)
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546K
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(d)
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273K
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44. If absolute temperature of a gas is doubled
and the and the pressure is reduces to one half, the volume of the gas will
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(a)
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Be doubled
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(b)
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Reduce to ¼
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(c)
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Remain unchanged
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(d)
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Quadruple
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45. Equal masses of methane and oxygen are mixed
in an empty container at 25ºC. The fraction of total pressure exerted by oxygen
is:
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(a)
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1/3
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(b)
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8/9
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(c)
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1/9
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(d)
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16/17
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46. The
order of the rate of diffusion of gases NH3, SO2, Cl2
and CO2 is:
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(a)
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NH3 > SO2 > Cl2 > CO2
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(b)
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NH3 > CO2 > SO2 > Cl2
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(c)
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NH3 > CO2 > Cl2 > SO2
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(d)
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Cl2 > SO2
> CO2 > NH3
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47. The
value of universal gas constant is/are:
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(a)
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0.0821 atm-dm3-mol-1-K-1
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(b)
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8.3143 J-mol-1-K-1
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(c)
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1.987 cal-mol-1-K-1
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(d)
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All of the above.
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48. Real
gases show deviations from ideal behaviour at:
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(a)
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Very high pressure and at very low temperature.
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(b)
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Very low pressure and at very low temperature.
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(c)
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Very high pressure and at very high temperature.
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(d)
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All of the above.
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50. How should the conditions be changed to
prevent the volume of a given gas from expanding when its mass is increased?
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(a)
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Temperature is lowered and
pressure is increased.
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(b)
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Temperature is increased and
pressure is lowered.
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(c)
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Temperature and pressure both
are lowered.
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(d)
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Temperature and pressure both
are increased.
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51. Which
one of the following statements is incorrect regarding pressure?
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(a)
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It is the force exerted on unit length.
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(b)
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Its S.I. unit is pascal and it is also expressed in torr.
|
|
(c)
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Atmospheric pressure varies with altitude.
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(d)
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One pascal is equivalent to 1 N-m-2.
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52. Which
one of the following statements is incorrect regarding absolute zero?
|
(a)
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It is the lowest or coldest possible temperature.
|
|
(b)
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At this temperature, molecular motion ceases.
|
|
(c)
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All the gases change into liquid and then
solid well before this temperature is achieved.
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(d)
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Its value is 273°C.
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53. Which
one of the following statements is incorrect regarding Boyle’s law?
|
(a)
|
It is stated as the volume of a
given mass of a gas is inversely proportional to pressure applied at constant
temperature.
|
|
(b)
|
Mathematically, Boyle’s law is
stated as; PV = constant.
|
|
(c)
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The graph
between V verses P is a parabolic curve while graph between V and 1/P is a
straight line.
|
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(d)
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Boyle’s law holds up well at
low temperature and high pressure.
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54. Which
one of the following statements is incorrect regarding Charle’s law?
|
(a)
|
It is stated as the volume of a given mass of a gas is directly
proportional to absolute temperature at constant pressure.
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|
(b)
|
Mathematically, Charles’s law is stated as; VT = constant.
|
|
(c)
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The graph between V verses T is a straight line.
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(d)
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Charles’s law holds up well at high temperature and low pressure.
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55. Which
one of the following is the application of Graham’s law?
|
(a)
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In separating different isotopes of a gas and in separating one gas
from another gas.
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(b)
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In diluting the poisonous gases and minimizing their toxic effect.
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|
(c)
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To determine molecular weight and density of gases.
|
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(d)
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All of the above.
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56. Which
one of the following is incorrect regarding partial pressure?
|
(a)
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Partial pressure is the individual gas pressure in a gaseous mixture.
|
|
(b)
|
Partial pressure is directly proportional to mole fraction.
|
|
(c)
|
Partial pressure varies inversely with number of moles of a gas.
|
|
(d)
|
Summation of partial pressures in a gaseous mixture
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57. Which
statement is incorrect regarding an ideal gas?
|
(a)
|
It is an imaginary and hypothetical gas.
|
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(b)
|
It obeys gas laws at all temperatures and pressures.
|
|
(c)
|
There are some gases which are perfectly ideal.
|
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(d)
|
Its behaviour can be predicted by kinetic molecular theory.
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