Online MCQs – Chemical Equilibrium – Chemistry 10th

Class 10th | Chemistry | Chapter 1 | Chemical Equilibrium | Solved Online MCQs Test

Online MCQs Test of Chapter 1 (Chemical Equilibrium) Chemistry Class 10th Science Group – Sindh Board. According to New Examination Pattern / Syllabus of Sindh Board

1. None of them

oxygen and carbon dioxide

carbon dioxide and methane

These are the most important part of the atmosphere.

nitrogen and oxygen

2. Equilibrium is a state in which:

the forward reaction rate is more than the reverse reaction rate

forward reaction rate and reverse reaction rate become zero

forward reaction rate and reverse reaction rate are equal

the forward reaction rate is less than the reverse reaction rate

3. The unit of K_c for reaction N₂ + O₂ ⇌ 2NO

mol^–1 dm³

mol^–2 dm⁶

mol dm^–3

no unit

4. None of these

Reactant concentration

K_c varies with:

Product concentration

Temperature

5. None of these

K_c is very large

K_c is very small

K_c is neither very small nor very large

This type of reaction is known as ‘Forward reaction’.

6. Which one is not a reversible reaction?

Freezing

Evaporation

Combustion

Melting

7. Conversion of ice into the water by melting and conversion of water into ice by freezing is an example of:

None of them

reversible reaction

chemical reaction

irreversible reaction

8. equal to 0

The forward reaction occurs, forming additional products

Both of these

Increase in product concentration for equilibrium.

Which statement is true if Q_c < K_c?

9. The state of dynamic equilibrium can be represented by:

Rate of the forward reaction > Rate of the reverse reaction

Rate of the forward reaction < Rate of the reverse reaction

Rate of the forward reaction = Rate of the reverse reaction

Rate of the forward reaction = Rate of the reverse reaction = 0

10. At the beginning the reaction:

quantity of reactant is higher, and the rate of product formation is higher

quantity of reactant is lower, and the rate of product formation is lower

quantity of reactant is higher, and the rate of product formation is lower

quantity of reactant is lower, and the rate of product formation is higher

11. Which reactions are irreversible reactions?
(i) Condensation
(ii) Combustion
(iii) Melting
(iv) Rusting

(i) and (iv)

(iii) and (iv)

(i) and (ii)

(ii) and (iv)

12. K_c = :

product / reactant

reactant / product

reactant x product

reactant

13. Numbers of moles

K_c is independent of :

Product concentration

Reactant concentration

Reactant and Product concentration

14. A reaction which is never goes to completion is known as reversible reaction. Reversible reaction is represented by:

double straight line

double arrow

single arrow

doted lines

15. The reaction rate depends on the concentration of the:

temperature

products

reactants

reactants and products

16. None of these

There is increase in product concentration as the process reverses, forming more reactants.

If Q_c > K_c:

There is decrease in product concentration as the process reverses, forming more products.

There is increase in product concentration as the process reverses, forming more products.

17. The direction of a reaction can be predicted by the type of arrow:

single arrow

double straight line

doted lines

double arrow

18. When the magnitude of K_c is small, indicates:

Reaction mixture contain almost equal amount of reactant and product

Reaction goes to completion

Reaction mixture contain most of the reactant

Reaction mixture contain most of the product

19. For which system does the equilibrium constant, K_c has units of concentration?

H_2(g)+ I_2(g) ⇌ 2HI_(g)

N_2(g)+ 3H_2(g) ⇌ 2NH_3(g)

CO_2(g)+ H_2(g) ⇌ CO_(g)+ H₂O_(l)

N_2(g)+ O_2(g) ⇌ 2NO_(g)

20. Which of these are reversible reactions?

Evaporation

Condensation

None of them

Condensation and Evaporation

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Online MCQs Test preparation for Chemistry Class 10th (Science Group Sindh Board) helps students practice effectively. These multiple-choice questions are taken from Chapter 1 “Chemical Equilibrium” of the Class 10th Chemistry textbook. They fully cover the requirements of the objective section in the examination. This activity is a valuable resource for excellent exam preparation. The Online MCQs Test provides students with the best platform to assess their knowledge and practice independently.

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