Thermochemical Reactions

Q.

The reaction of sodium hydroxide with hydrochloric acid results in

1. Salt and water

2. Salt and hydrogen gas

3. Salt and oxygen gas

4. Salt, hydrogen and oxygen

Q.

When zinc reacts with very dilute nitric acid it produces-

1. $\mathrm{NO}$

2. ${\mathrm{NH}}_4{\mathrm{NO}}_3$

3. ${\mathrm{NO}}_2$

4. ${\mathrm{H}}_2$

Q.

What is the difference between endergonic and endothermic?

Q.

What is endothermic reaction

Q.

The chemical reactions in which the light energy is liberated or absorbed is called thermochemical reactions.

1. False

2. True

Q.

Can we use potassium in place of sodium for preparing Lassaignes extract?

Q.

What happens when iron fillings are added to dilute hydrochloric acid?

1. Hydrogen gas and Iron chloride are produced.

2. Chlorine gas and Iron hydroxide are produced.

3. No reaction takes place

4. Iron salt and water are produced.

Q. What is. an exothermic reaction

Q.

Which of the following gases is formed when solid sodium carbonate reacts with dilute hydrochloric acid?

1. Hydrogen

2. Oxygen

3. Carbon dioxide

4. Carbon monoxide

Q.

Chemical reactions may or may not produce a colour change.

1. True
2. False

Q.

Which of the following is/are thermochemical equations?

1. Lighting a candle

2. Combustion of fuel

3. Solution of sulphuric acid in water

4. Respiration

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

1. 2

Q.

Which of these chemical reactions produce a gas?

1. Iron dropped into copper sulphate solution

2. Silver nitrate is added to a sodium chloride solution

3. Ammonia gas reacting with hydrochloric acid

4. Zinc reacting with dilute sulphuric acid

Q. Reaction in which energy is absorbed is known as ______ reaction.

1. endothermic
2. oxidation
3. exothermic
4. reduction

Q. Endothermic reactions are those which release heat.

1. True
2. False

Q.

Making use only of substances chosen from those given below:

Dilute Sulphuric acid, Sodium carbonate , Zinc , Sodium sulphite, Lead Calcium carbonate

Give the equations for the reactions by which you could obtain

Hydrogen.

Q.

During electrolysis of carbonate (${C{O}_3}^{-2}$), nitrate (${N{O}_3}^{-1}$) and sulphate (${S{O}_4}^{-2}$) based electrolyte, the gas that is formed at anode is ____________.

1. $C{O}_2$

2. $N_2$

3. $O_2$

4. $S{O}_2$