🔥🌟 Grand Chemistry MCQs Test for Class 9 | Interactive Quiz 🧪💡

Welcome to Inamjazbi Learn Chemistry! 🎉 This ultimate Class 9 Chemistry MCQs test covers Atomic Structure, Periodic Table, Chemical Bonding, and much more. Test your knowledge with interactive questions, get instant feedback on each answer, and see your final score at the end! 🧠Keep track of your score and challenge yourself!

Whether you are preparing for exams or just love Chemistry, this quiz is perfect for sharpening your concepts. Ready, set, answer! ⚡

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🔥🌟 Grand Chemistry MCQs Test for Class 9 | Interactive Quiz 🧪💡 | Learn & Practice!

1. If proton number is 19, electron configuration will be:

a) 2, 8, 9

b) 2, 8, 8, 1

c) 2, 8, 1

d) 2, 8, 3

Correct Answer: (b)

Potassium (Z=19) → 2, 8, 8, 1.

2. If nucleon number of potassium is 39, number of neutrons will be:

a) 39

b) 19

c) 20

d) 29

Correct Answer: (c)

Number of neutrons = Mass number - Atomic number = 39 - 19 = 20.

3. The isotope C-12 is present in abundance of:

a) 96.9%

b) 97.6%

c) 98.8%

d) 99.7%

Correct Answer: (c)

The abundance of C-12 is approximately 98.8%.

4. Which one of the following is most penetrating?

a) Electron

b) Proton

c) Alpha particle

d) Neutron

Correct Answer: (d)

Neutrons are uncharged and highly penetrating.

5. Name the material of screen used in Rutherford atomic model:

a) Aluminum foil

b) Zinc sulphide

c) Sodium sulphide

d) Aluminum sulphide

Correct Answer: (b)

Rutherford used a zinc sulphide screen for detecting alpha particles.

6. 4th and 5th period in periodic table are known as:

a) Short period

b) Long period

c) Very long period

d) Normal period

Correct Answer: (b)

4th and 5th periods are long periods with 18 elements each.

7. Which one of the following decreases along the period?

a) Ionization Energy

b) Atomic Radius

c) Electronegativity

d) Electron Affinity

Correct Answer: (b)

Atomic radius decreases across a period due to increasing nuclear charge.

8. The shielding effect across the period:

a) Increases

b) Decreases

c) Moderate

d) Remain same

Correct Answer: (d)

Shielding effect remains same across a period as number of shells remains same.

9. In group, electron affinity values decreases from top to bottom because:

a) Atomic size normal

b) Atomic size increases

c) Atomic size decreases

d) Atomic size same

Correct Answer: (b)

Electron affinity decreases down the group as atomic size increases.

10. Interaction between highly electron deficient hydrogen and highly electronegative atom is called:

a) Ionic bond

b) Metallic bond

c) Hydrogen bond

d) Covalent bond

Correct Answer: (c)

This is a hydrogen bond.

11. Number of electrons lost by atoms of group IIIA equals:

a) 1

b) 2

c) 3

d) 4

Correct Answer: (c)

Group IIIA elements lose 3 electrons.

12. In NaCl crystal lattice each Na ion is surrounded by:

a) 6 Cl⁻ ions

b) 6 Na⁺ ions

c) 8 Cl⁻ ions

d) 12 Cl⁻ ions

Correct Answer: (a)

Each Na⁺ is surrounded by 6 Cl⁻ ions in cubic lattice.

13. Which of the following gas diffuses fastest?

a) Hydrogen

b) Chlorine

c) Fluorine

d) Helium

Correct Answer: (a)

Hydrogen is the lightest gas → fastest diffusion.

14. The vapour pressure of a liquid increases with the increase of:

a) Pressure

b) Polarity of molecules

c) Intermolecular forces

d) Temperature

Correct Answer: (d)

Vapour pressure increases with temperature.

15. One atmospheric pressure is equal to:

a) 10325 Pascal

b) 106075 Pascal

c) 10523 Pascal

d) 101325 Pascal

Correct Answer: (d)

1 atm = 101325 Pa.

16. Which of the following have sharp melting point in solids?

a) Plastic

b) Rubber

c) Glass

d) Diamond

Correct Answer: (d)

Diamond has a sharp melting point due to strong covalent bonding.

17. The density of gases increases when its :

a) Pressure increased

b) Temperature increased

c) Volume increased

d) None of these

Correct Answer: (a)

Density ∝ Pressure / Temperature, so increasing pressure increases density.

18. Solubility is usually expressed in grams of the solute dissolved in ________ gram of a solvent:

a) 10 grams

b) 100 grams

c) 500 grams

d) 1000 grams

Correct Answer: (b)

Solubility is typically expressed in g per 100 g solvent.

19. 2 moles of sodium chloride (NaCl) is equal to:

a) 123 grams

b) 135 grams

c) 117 grams

d) 158 grams

Correct Answer: (c)

Molar mass NaCl = 58.5 g → 2 moles = 117 g.

20. Molarity of a solution which is prepared by dissolving 40 g sodium chloride in 500cm³ of solution is:

a) 1.4 M

b) 1.5 M

c) 1.36 M

d) 1.33 M

Correct Answer: (c)

Molarity = moles / L = (40/58.5)/0.5 ≈ 1.36 M

21. Which solution contains more water?

a) 1.0M

b) 0.75 M

c) 0.5M

d) 0.25M

Correct Answer: (d)

Lower molarity means more solvent (water) present.

22. Which one is oxidizing agent?

a) Al

b) H₂S

c) Cl₂

d) NaH

Correct Answer: (c)

Cl₂ can accept electrons → oxidizing agent.

23. Chlorine can be displaced by _________

a) Br

b) I

c) F

d) At

Correct Answer: (c)

More reactive halogen can displace less reactive halogen. F is most reactive halogen F>Cl>Br>I.

24. Which one is not strong acid?

a) HF

b) HBr

c) HI

d) HCl

Correct Answer: (a)

HF is weak acid due to strong H-F bond.

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