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

The reaction is a reverse reaction, if K_c is:

equal to 1

larger than 1

less than 1

2. At the beginning the reaction:

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

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 lower

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

3. In a reversible reaction, dynamic equilibrium is established:

it depends on the amount of reactants

at any time

before the completion of reaction

after the completion of reaction

4. The rate of a reaction is directly proportional to the product of the active masses of the:

products

products and reacting substances

None of them

reacting substances

5. asher There is decrease in product concentration as the process reverses, forming more reactants.

reactions never finish

If K_c is very small, then:

reactions are considered to be at equilibrium

reactions are virtually complete

6. Q_c can be defined as:

ratio of molar concentration of product and reactant at specific time

ratio of molar concentration of product and reactant raised to the power of coefficient

ratio of molar concentration of product and molar volume of reactant

ratio of product and reactants

7. The rate at which a substance reacts is directly proportional to its:

density

active mass

concentration

atomic mass

8. Which one is not a reversible reaction?

Combustion

Freezing

Melting

Evaporation

9. Many physical and chemical changes are occurring in our surrounding which may be due to:

None of these

physical reaction

Both chemical and physics reaction

chemical reaction

10. Numbers of moles

Reactant and Product concentration

Reactant concentration

K_c is independent of :

Product concentration

11. Which statement is NOT true for reverse reaction?

It is always directed from left to right in a chemical reaction

All of them

Product produce reactant (Reactants ⟶ Products)

Initially rate is slow but gradually speeds up

12. Equilibrium is a state in which:

forward reaction rate and reverse reaction rate are equal

the forward reaction rate is less than the reverse reaction rate

forward reaction rate and reverse reaction rate become zero

the forward reaction rate is more than the reverse reaction rate

13. None of these

Reactant concentration

K_c varies with:

Product concentration

Temperature

14. None of them

carbon dioxide and methane

nitrogen and oxygen

These are the most important part of the atmosphere.

oxygen and carbon dioxide

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

None of them

irreversible reaction

reversible reaction

chemical reaction

16. A chemical reaction is a chemical change which involves:

reactants

None of these

products

reactants and products

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

reactants and products

reactants

products

temperature

18. oxygen and ozone

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

N_2(g)+ 3H_2(g) ⇌ 2NH_3(g)

N_2(g)+ O_2(g) ⇌ 2NO_(g)

H_2(g)+ I_2(g) ⇌ 2HI_(g)

CO_2(g)+ H_2(g) ⇌ CO_(g)+ H₂O_(l)

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

mol dm^–3

mol^–2 dm⁶

no unit

mol^–1 dm³

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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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