Multiple choice questions; MCQs on Fundamentals of Chemistry Class IX
Q1. Pick up the correct answer (Multiple
choice questions; MCQs)
1. Which of the following scientists arranged the elements in the periodic table?
(a) Henry Becquerel
(b) D. I. Mendeleev
(c) Neil Bohr
(d) Rutherford
2. Which of the following scientists is considered as the
father of modern chemistry?
(a) J. Priestley
(b) Robert Boyle
(c) J. J. Thomson
(d) Jabir
Bin Hayan
3. Which one of the following scientists put forward laws
of electrolysis?
(a) D. I. Mendeleev
(b) Neil Bohr
(c) M. Faraday
(d) Rutherford
4. which
of the following is a homo atomic molecule?
(a) H2
(b) NH3
(c) H2O
(d)
CO2
5. The radioactive isotope of hydrogen is:
(a) Deuterium
(b) Protium
(c) Tritium
(d) None of them
6. Owing to same atomic number, isotopes have the same
properties:
(a) Thermal
(b) Chemical
(c) Electrical
(d) Physical
7. Cl – 35 is found in nature up to:
(a) 35%
(b) 75%
(c) 30%
(d)
25%
8. The chemical formula of caustic soda is
(a) KOH
(b) NaCl
(c) NaOH
(d) CaCO3
9. The empirical formula of glucose is
same as that of
(a) Ethene
(b) Ethyne
(c) Glucose
(d) Acetic
acid
10. The number of neutron in chlorine-37 atom is ……………
(a) 37
(b) 20
(c) 17
(d)
18
11. The atomic number of iron is ……..
(a) 56
(b) 26
(c) 36
(d)
35
12. Kalium is the Latin name for
(a) Iron
(b) Krypton
(c) Potassium
(d) Sodium
13. Monoisotopic elements have ……….. isotopes.
(a) 1
(b) 2
(c) 3
(d)
No
14. The chemical formula of nitric acid is ………….
(a) HCl
(b) HF
(c) HNO3
(d) H2SO4
15. The number of neutrons in aluminum atom is ……………
(a) 13
(b) 14
(c) 27
(d)
7
16. Which isotope is used to estimate the
age of fossils?
(a)Carbon-14
(b)Strontium-90
(c) Gold-198
(d) Iodine-131
17. Cobalt-60 is used for the treatment of
(a) skin cancer
(b) thyroid glands
(c) heart beat
(d) body
cancer
18. Which one of the following is NOT a
free radical?
(a) Ho
(b) Clo
(c) CHo3
(d) CH+4
19. Free radicals are atoms and group of
atoms having number of
(a) Paired electrons
(b)unpaired electrons
(c) Valence electron
(d)
None of them
20. Molecular ion is formed from a molecule by the
(a) Combination of atoms
(b) homolytic breakage
(c) Ionization
(d) All of
them
21. Which of the following is NOT a
reactive specie?
(a) Molecular ion
(b) Free radical
(c) Molecule
(d) None
of them
22. The empirical formula of benzene is
same as that of
(a) Ethene
(b) Ethyne
(c) Glucose
(d) Acetic
acid
23. The number of formula units in one
mole of NaCl is
(a) 6.02 x 1023
(b) 12.04 x 1023
(c) 18.06 x 1023
(d) 24.08 x 1023
24. How many moles of helium gas occupy
22.4 litre at 0ºC and 1 atm pressure?
(a) 0.11
(b) 1.0
(c) 0.90
(d) 1.11
25. Which of the following have same
empirical and molecular formulae?
(a) H2O
(b) CH4
(c) CO2
(d)
All of them
26. The molecular formula of benzene
is:
(a) CH2
(b) C6H6
(c) CH
(d)
None of these
27. Which of the following has an
empirical formula of CH2O?
(a) C6H12O6
(b) CH3COOH
(c) HCHO
(d) All of them
28. The molecular formula of hydrogen
peroxide is:
(a) H2O
(b) H2O2
(c) OH
(d)
HO
29. Which of the following has a molar
mass of 44 g?
(a) CO
(b) NO
(c) C3H8
(d) All of them
30. The molar mass of CH3COOH
is -----------g
(a) 88
(b) 42
(c) 60
(d)
62
31. 2 g of H2 contains
----------- molecules.
(a) 3.01 x 1023
(b) 1.204 x 1023
(c) 3.01 x 1022
(d)
6.02 x 1023
32. 10 moles of sodium are equal to
------------ g.
(a) 23
(b) 230
(c) 2300
(d) 2.3
33. 14 g of nitrogen (N2) gas
constitutes its …….. moles
(a) One
(b) Half
(c) Two
(d) Ten
34. 180 g of H2O contains
----------- molecules.
(a) 3.01 x 1023
(b) 1.204 x 1023
(c) 1.204 x 1024
(d)
6.02 x 1024
35. Who proposed term ‘elements’ as
composition of organic and inorganic bodies with particular shape?
(a) Jabir Ibne-Haiyan
(b) Democritus
(c) Aristotle
(d) Plato
36. Who Proposed hypothesis about wave
particle duality nature of electron?
(a) Schrodinger
(b) De Broglie
(c) Crooke
(d) Heisenberg
37. Which scientist invented experimental
methods of nitric acid, hydrochloric acid and white lead.
(a) Jabir Ibne-Haiyan
(b) Democritus
(c) Aristotle
(d) Plato
38. One mole of carbon-12 has a mass of:
(a) 0.0224 kg
(b) 1 kg
(c) 12 kg
(d)
0.012 kg
39. What is the mass of one mole of iodine
(I2) molecule?
(a) 127 g
(b) 254 g
(c) 74 g
(d)
53 g
40. Which of the following is classified
as a monoatomic element?
(a) Nitrogen
(b) Milk
(c) Helium
(d)
Oxygen
41. The mass of a single hydrogen atom is:
(a) 1.67 x 10−20 g
(b) 1.67 x 10−24 g
(c) 1.67 x 10−27 g
(d) 1.67 x10−23g
42. 11.2 dm3 of nitrogen gas at
STP weighs:
(a) 56 g
(b) 14 g
(c) 7 g
(d)
28 g
43. One mole of carbon-12 has a mass of:
(a) 0.0224 kg
(b) 12 kg
(c) 1 kg
(d)
12 g
38. Which of the following is classified
as a diatomic element?
(a) Helium
(b) Oxygen
(c) Neon
(d)
Argon
44. The total number of ions in one mole
of CaCl2 is
(a) 6.02 x 1023
(b) 12.04 x 1023
(c) 18.06 x 1023
(d) 24.08 x 1023
45. The total number of ions in one mole
of NaCl is
(a) 6.02 x 1023
(b) 12.04 x 1023
(c) 18.06 x 1023
(d)
24.08 x 1023
46. 5 moles of magnesium are equal to
------------ g.
(a) 2400
(b) 24
(c) 120
(d)
180
47. A quantity containing Avogadro’s
number of particles is called:
(a) Gram atom
(b) Gram molecule
(c) Gram formula
(d) Mole
48. One mole of hydrogen gas at s.t.p. contains how many atoms
(a) 3.01 x 1024
(b) 1.2 x 1024
(c) 12.04 x 1046
(d)
6.02 x 1023
49. 16 g of oxygen has a volume of:
(a) 22.4 dm3
(b) 22400 cm3
(c) 5.6 dm3
(d)
11.2 dm3
50. 11.2 dm3 of Cl2
gas at s.t.p. weighs:
(a) 71g
(b) 35.5 g
(c) 37 g
(d)
17 g
51. A piece of matter in pure form is
termed as:
(a) Radical
(b) Mixture
(c) Compound
(d) substance
52. Which of the following can be separated
by physical means?
(a) Mixture
(b) Element
(c) Compound
(d) Substance
53. The empirical formula of hydrogen
peroxide is:
(a) H2O2
(b) HO
(c) OH
(d)
O2H2
54. A formula that indicates actual number
and type of atoms in a molecule is called:
(a) Chemical formula
(b) Empirical formula
(c) Molecular formula
(d) Formula mass
55. The number of protons in an atom is equal to the number of
………. in it.
(a) Orbits
(b) Electrons
(c) Shells
(d)
Neutrons
56. The number of neutrons in an atom of iron (mass number =56
and Z =26) is
(a) 26
(b) 56
(c) 32
(d)
30
57. Number of neutron = atomic mass number ▬ ………….
(a) atomic number
(b) no of neutron
(c) no of electron
(d) All of them
58. There are total …………….. monoisotopic elements.
(a) 23
(b) 21
(c) 33
(d)
31
59. The atomic number of fluorine is ……..
(a) 9
(b) 17
(c) 16
(d)
19
60. The Latin name of sodium is
(a) Aurum
(b) Ferrum
(c) Kalium
(d) Natrium
61. ……………discovered isotopes.
(a) Berzelius
(b) Soddy
(c) Thomson
(d) Bohr
62. The volume of 4 g of H2 gas
at STP is
(a) 22.4 dm3
(b) 44.8 dm3
(c) 67.2 dm3
(d) None of
them
63. One mole of any covalent compounds
contains same number of
(a) Atoms
(b) Molecules
(c) Ions
(d) Electrons
64. The
one gram atom an element is equal to its:
(a) Gram molecular mass
(b) Gram atomic mass
(c) Gram formula mass
(d) Mole
65. the molar mass of Al2O3
is
(a) 102 amu
(b) 102 g
(c) 102 g/mol
(d) All of them
66. the molar mass of MgCl2 is
(a) 95 amu
(b) 95 g
(c) 95 g/mol
(d) All of
them
67. the molecular mass of C2H5OH
is
(a) 46 amu
(b) 46 g
(c) 46 g/mol
(d)
All of them
68. The
present scale of atomic mass is based on 1 amu being equal to the mass of:
(a) 1 hydrogen atom
(b) 1/10 of O-16
(c) 1/12 of C-12 atom
(d) 1/16 of O-16
69. Number of particles = __________.
(a) no. of moles x 6.02x1024
(b) no. of moles x 6.02x1023
(c) n x molar mass
(d) None of
them
70. The
formula mass of an ionic compound expressed in grams, called ______.
(a) gram formula
(b) gram atom
(c) gram atom
(d) All of them
71. Avogadro’s number is a collection ______ particles.
(a) 6.02 x 1043
(b) 6.02 x 1023
(c) 6.02 x 1022
(d)
6.02 x 1024
72. 2
g of H2 contains ----------- molecules.
(a) 3.01 x 1023
(b) 1.204 x 1023
(c) 3.01 x 1022
(d)
6.02 x 1023
73. The mass
of one molecule of water is:
(a) 1.99 x10−23 g
(b) 2.99 x10−23 g
(c) 2.99 x10−24 g
(d)
1.99 x10−20 g
74. 44 a.m.u of carbon dioxide is equal to:
(a) Molar Mass
(b) Atomic Mass
(c) Molecular Mass
(d) Mass Number
75. Number of molecules present in 18 grams of water (H2O)
is:
(a) 6.02 x 1023
(b) 6.02 x 1024
(c) 6.02 x 1030
(d)
6.02 x 1034
76. Molecular mass expressed in grams is called
(a) Atomic mass
(b) Gram molecular mass
(c) Formula mass
(d) Equivalent
mass
77. How many molecules are there in 36 g of water?
(a) 12.04 x 1023
(b) 6.02 x 1023
(c) 6.20 x 1022
(d)
6.20 x 1023
78. ‘NA’ denotes
(a) Avogadro’s hypothesis
(b) Avogadro’s number
(c) Gas constant
(d) Molar volume
79. According to Avogadro, one gram mole
of any gas at STP occupies volume of
(a) 22.4 dm3
(b) 224 dm3
(c) 2.24 dm3
(d)
None of them
89. 10 moles of KOH are equal to
------------ g.
(a) 560
(b) 400
(c) 80
(d)
200
81. Which of the following has a molar
mass of 46 g?
(a) NH2CONH2
(b) CH3COOH
(c) C2H5OH
(d)
None
82. Which of the following has a molar
mass of 34 g?
(a) H2O
(b) H2O2
(c) C2H6
(d) None
83. 35.5 g of chlorine (Cl2)
gas constitutes its …….. moles
(a) One
(b) Two
(c) Half
(d)
Ten
84. 9 g of H2O contains
----------- molecules.
(a) 6.02 x 1023
(b) 1.204 x 1023
(c) 3.01 x 1023
(d) 3.01 x 1023
85. The atomic mass of an element expressed
in gram is:
(a) Gram molecular mass
(b) Gram atomic mass
(c) Gram formula mass
(d) Mole
86. The molar mass of H2SO4
is:
(a) 98 a.m.u
(b) 9.8 g
(c) 98 g
(d)
9.8 a.m.u
87. A formula that indicates actual number
and type of atoms in a molecule is called:
(a) Chemical formula
(b) Empirical formula
(c) Molecular formula
(d)
Formula mass
88. The Empirical formula of hydrogen
peroxide is:
(a) HO
(b) H2O2
(c) OH
(d)
OH2
89. 16 g of oxygen gas constitutes its
…….. moles.
(a) Half
(b) One
(c) Two
(d)
Ten
90. The molar mass of H2CO3
is ------------ g
(a) 98
(b) 62
(c) 63
(d)
88
91. 36 g of H2O contains
----------- molecules.
(a) 1.204 x 1024
(b) 1.204 x 1023
(c) 3.01 x 1023
(d) 6.02 x 1023
92. 5 moles of water are equal to
------------ g.
(a) 80
(b) 90
(c) 18
(d)
180
93. Which of the following has a molar
mass of 50 g?
(a) NH2CONH2
(b) CH3COOH
(c) C2H5OH
(d)
None
94. 20 g of hydrogen gas constitutes its
…….. moles
(a) One
(b) Two
(c) Half
(d)
Ten
95. Ethyl alcohol was prepared by:
(a) Jaber bin-Hayan
(b) Al-Razi
(c) Al-Beruni
(d)
Ibne-Sina
96. Al-Razi prepared …………. by fermentation process.
(a) Sulphuric acid
(b) Ethyl alcohol
(c) Acetic acid
(d)
Methane
97. Who determined densities of different
substances?
(a) Jaber bin-Hayan
(b) Al-Razi
(c) Al-Beruni
(d)
Ibne-Sina
98. Who proposed idea of a substance as a
combination of matter and form and described theory of the Four
Elements, fire, water,
earth, air
(a) Jabir Ibne-Haiyan
(b) Democritus
(c) Aristotle
(d) Plato
99. Who proposed fourth state of matter?
(a) Stendra Nath Bose
(b) Elbert Einstein
(c) both of them
(d)
none of them
100. Who put forward idea chemistry as
systematic investigation of nature and discovered the gaseous law?
(a) J. Priestly
(b) Robert Boyle
(c) J. Black
(d) Scheele
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