Heat Evolved

Q.

The reactions which produce light and heat are known as _______________.

1. combustion reaction

2. exothermic reaction

3. endothermic reaction

4. photochemical reaction

Q.

Statement 1: Nitrogen and hydrogen combine together to form ammonia.
Statement 2: It is an exothermic reaction.

1. Statement 1 is false and Statement 2 is true

2. Both Statement1 and Statement2 are true.

3. The Statement1 is true but the Statement 2 is false.

4. Both Statement 2 and Statement 1 are false.

Q.

Burning of coal ______energy.

1. absorbs

2. releases and then absorbs

3. can't predict

4. releases

Q.

When water is added to quick lime,

1. a little amount of heat energy is evolved.

2. a large amount of heat energy is evolved.

3. a large amount of heat energy is absorbed.

4. a little amount of heat energy is absorbed.

Q.

What happens when quick lime is added to water?

1. Heat is evolved

2. Heat is absorbed

3. Nothing

4. No change in heat

Q.

Respiration is an exothermic process (release of energy).

1. True

2. False

Q.

Which among the following is an exothermic reaction (releases energy)?

1. Melting solid salts

2. Heating water

3. All of the given options

4. Reaction during respiration

Q.

When dilute hydrochloric acid reacts with sodium hydroxide,

1. some heat is absorbed

2. some heat is released

3. no heat is released

4. depends

Q.

During a chemical reaction, if the reactants have more chemical energy than the products formed,

1. energy is absorbed

2. energy is released

3. no changes in energy

4. depends

Q. Which of the following is an example of exothermic reaction?

1. Evaporation
2. Sublimation
3. Combustion
4. Melting