Photodecomposition Reaction

Q.

Define photolytic decomposition reaction.

Q. The conversion of ${\text{CaCO}}_3$ into $\text{CaO}$ is an example of ____________ reaction.

1. decomposition
2. combination
3. double displacement
4. displacement

Q.

Which of the following is an example of a decomposition reaction?

1. Splitting of water into hydrogen and oxygen

2. Carbon completely burnt in oxygen yields carbon dioxide

3. Calcium oxide combined with water gives calcium hydroxide.

4. Oxygen combines with carbon monoxide, and carbon dioxide is formed.

Q.

Which of the following is used as an anti-knocking compound ?

1. TEL

2. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$

3. Glyoxal

4. Freon

Q.

Why during laboratory preparation of hydrogen it is collected by downward displacement

Q.

Give an example of a chemical reaction for the following situation: Sound is produced.

Q.

Which of the following compounds will not undergo decomposition on passing electricity through the aqueous solution?

1. Sugar

2. Sodium Chloride

3. Sodium Bromide

4. Sodium Acetate

Q.

Medicines and chemicals are stored in dark colored bottles to prevent their:

1. photochemical decomposition

2. electrolysis

3. thermochemical reactions

4. neutralisation

Q. In the electrolysis of molten sodium chloride, what is the yellow green gas formed?

1. Chlorine
2. Hydrogen
3. Oxygen
4. Chloride

Q.

1. Oxygen in the form of a gas and hydrogen in liquid form

2. Oxygen and Hydrogen in the form of gases

3. Oxygen in the form of a liquid and Hydrogen in the form of gas

4. Oxygen and Hydrogen in a liquid form

Q.

What is a decomposition reaction?

Q.

Explain the following types of chemical reactions giving two examples for each of them.

(a) Combination reaction

(b) Decomposition reaction

Q.

Decomposition reaction gives us __________ compounds.

1. complex

2. larger

3. simpler

4. none of the above

Q.

State four uses of hydrogen gas.

Q.

What is the colour of ${\text{FeSO}}_4.7{\text{H}}_2\text{O}$ crystals? How does this colour change upon heating and what are the products formed? [3 MARKS]

Q.

Explain the following types of chemical reactions giving two examples for each of them.

(a) Combination reaction

(b) Decomposition reaction

Q.

All decomposition reactions are not endothermic reactions.

1. True

2. False

Q. Most of the decomposition reactions are:

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

Q.

Select the correct word from the list given in the bracket for each of the following statements.
Ammonia burns with a _____ flame producing nitrogen and water vapor (yellowish green/blue)

Q. To separate sodium and cloride we use electrolysis process . In this process we use water too. In this case how to find the difference between hydrolysis and electrolysis?