Endothermic Reactions

Q.

Why is decomposition of vegetable matter into compost considered an exothermic reaction?

Q.

$\underset{\mathrm{Potassium}\mathrm{nitrate}}{{\mathrm{KNO}}_3\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\to \underset{\mathrm{Potassium}\mathrm{Hydroxide}}{\mathrm{KOH}\left(\mathrm{l}\right)}+\underset{\mathrm{Nitric}\mathrm{acid}}{{\mathrm{HNO}}_3\left(\mathrm{l}\right)}$ The above reaction is _________ reaction.

Q.

Heat is absorbed when glucose is dissolved in water.

1. True
2. False

Q.

Quicklime (CaO - Calcium Oxide) reaction with water is regarded as exothermic. A student mixes these two products in a test tube and touches its side surface. Which of the following statement correctly describes the student's observation?

1. The test tube becomes cold due to the release of heat energy.

2. The test tube becomes hot due to the release of heat energy.

3. The test tube becomes hot due to absorption of heat energy.

4. The test tube becomes cold due to absorption of heat energy.

Q.

A reaction in which heat is absorbed is called as an ___ reaction

Q.

Formation of hydrogen chloride from hydrogen and chlorine is an example of ____________ (electrochemical/photochemical) reaction.

Q.

What is an endothermic change?

Q.

The statement given below is incorrect. Write the correct statement.

The decomposition of ammonium chloride into ammonia and oxygen is an exothermic reaction.

Q.

Why water is never added to acid?

Q.

Name a change in which energy is absorbed in the form of heat .

Q.

What is an exothermic change?

Q. Melting of wax is a change and an process.

1. physical
2. chemical
3. endothermic
4. exothermic

Q.

Mention the use of the following

Mercury

Q.

Explain exothermic reactions with the help of examples.

Q. What is the change taking place in the following processes ?

1. Irreversible, physical change
2. Irreversible, chemical change
3. Reversible, physical change
4. Reversible, chemical change

Q. Select endothermic reaction:

1. $S^{-}\left(g\right)+e^{-}\left(g\right)\to S^{2-}\left(g\right)$
2. $Ne\left(g\right)+e^{-}\left(g\right)\to N{e}^{-}\left(g\right)$
3. $N\left(g\right)+e^{-}\left(g\right)\to N^{-}\left(g\right)$
4. none of the above

Q.

Which among the following changes are exothermic or endothermic in nature?

(d) Dissolution of ammonium chloride in water

Q.

Reactions in which energy is absorbed, usually in the form of heat are known as ___ reactions.

1. Neutralisation

2. Photochemical

3. Exothermic

4. Endothermic

Q. is saponification is heat evolved?

Q.

A process in which heat is released along with the formation of products is called ___.

1. Endothermic process

2. Electrolysis

3. Exothermic process

4. Electroplating

Q.

Which of the following changes are exothermic and endothermic in nature?

(a) Decomposition of ferrous sulphate

(b) Dilution of sulphuric acid

(c) Dilution of sodium hydroxide in water

(d) Dissolution of ammonium chloride salt in water

Q.

Conversion of frost to water vapour is an example of

1. endothermic reaction

2. exothermic reaction

3. photochemical reaction

4. none of the above

Q. What is the change taking place in the following processes ?

1. Irreversible, chemical change
2. Reversible, physical change
3. Reversible, chemical change
4. Irreversible, physical change

Q. How many processes shown in the following images are endothermic?

1. 2

Q. Melting of wax is a change and an process.

1. physical
2. chemical
3. endothermic
4. exothermic

Q.

Chemical reaction in which heat is absorbed is called:

1. endothermic

2. respiration

3. exothermic

4. rusting

Q.

Electrolysis of water is a/an ____ reaction.

1. exothermic

2. displacement

3. combination

4. endothermic

Q. Reactions in which energy is absorbed, usually in the form of heat are known as endothermic reactions.

1. False
2. True

Q.

When potassium permanganate is heated it produces potassium manganate, manganese dioxide and oxygen gas. This is an example of ______ reaction.

1. electrochemical

2. exothermic

3. electrolytic

4. endothermic