EM 10th Science - Unit

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EM 10th Science - Unit - 10

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Choose the correct answer

2. Photolysis is a decomposition reaction caused by ___________

1 point

heat

electricity

light

mechanical energy

Clear selection

5. Which of the following statements are correct about a chemical equilibrium?

(i) It is dynamic in nature.

(ii) The rate of the forward and backward reactions are equal at equilibrium.

(iii) Irreversible reactions do not attain chemical equilibrium.

(iv) The concentration of reactants and products may be different.

1 point

i, ii and iii

i, ii and iv

ii, iii and iv

i, iii and iv

Clear selection

9. The pH of a solution is 3. Its [OH–] concentration is

1 point

1 × 10⁻³ M

3 M

1 × 10⁻¹¹ M

11 M

Clear selection

10. Powdered CaCO₃ reacts more rapidly than flaky CaCO₃ because of ___________.

1 point

large surface area

high pressure

high concentration

high temperature

Clear selection

11. In a combustion reaction

1 point

oxygen gas is released

nitrogen gas is released

oxygen gas is utilised

nitrogen gas is utilised

Clear selection

12. The amount of product formation in a reversible reaction ________ when the periodic removal of the product takes place.

1 point

increases

decreases

first decreases then increases

first increases and then decreases

Clear selection

13. In a chemical equilibrium, the concentrations of reactants and products are ___.

1 point

remain different

remain same

cannot be predicted

are not equal

Clear selection

Fill in the blanks.

1. A reaction between an acid and a base is called ______________

1 point

2. When lithium metal is placed in hydrochloric acid, ___________gas is evolved

1 point

3. The equilibrium attained during the melting of ice is known as ________________

1 point

4. The pH of a fruit juice is 5.6. If you add slaked lime to this juice, its pH _______________(increase/decrease).

1 point

6. The normal pH of human blood is _______.

1 point

7. Electrolysis is a type of _________ reaction.

1 point

8. The number of products formed in a synthesis reaction is ___________

1 point

9. Chemical volcano is an example for ___________type of reaction.

1 point

True or False

1. Silver metal can displace hydrogen gas from nitric acid

1 point

True

False

Clear selection

2. The pH of rainwater containing dissolved gases like SO3, CO2, NO2 will be less than 7.

1 point

True

False

Clear selection

3. At the equilibrium of a reversible reaction, the concentration of the reactants and the products will be equal.

1 point

True

False

Clear selection

4. Periodical removal of one of the products of a reversible reaction increases the yield.

1 point

True

False

Clear selection

5. On dipping a pH paper in a solution, it turns into yellow. Then the solution is basic.

1 point

True

False

Clear selection

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