Photochemical Reactions

Q.

There is a colour change observed in silver bromide when exposed to sunlight. This is due to

1. photochemical displacement

2. Both B and C

3. photochemical decomposition

4. photochemical combination

Q.

Oxygen liberated during photosynthesis comes from

1. Water

2. chlorophyll

3. carbon dioxide

4. Glucose

Q. Which of the following is an example of a photochemical reaction?

1. Dissolving pottassium permanganate in water
2. Reaction of sodium with water
3. Bioluminescence in fireflies
4. Dissolving ink droplets in water

Q.

How are photosynthesis and photorespiration different?

Q. During bioluminescence, energy is converted to energy.

1. light
2. heat
3. chemical
4. sound

Q.

Chemical reactions that take place by the action of light energy are called _______.

Q.

Plants use CO_​​2 for photosynthesis during the day . But at night , they also respire , i.e., take in O_{​​​​​​2} and release CO_{2​​​​} into the air . This doesn't help much in the reduction of CO_{​​​​​2} . Then why do people ask to plant more trees ? Is there a more effective method to reduce CO_{​​​​​2} in the air ?

Q. The chemical reactions which are initiated by are called photochemical reactions.

1. light
2. heat
3. electricity

Q.

State whether the statement is true or false.

Carbon dioxide is released during photosynthesis.

1. True
2. False

Q.

The production of light inside a firefly via a chemical reaction is technically termed as ­­­_________.

Q. Which of the following is responsible for decomposition of silver bromide?

1. Heat
2. Electricity
3. Moisture
4. Light

Q. What is the product of photochemical reaction found in plants?

1. Glucose, oxygen
2. Water, Carbon dioxide
3. Carbon dioxide, glucose
4. Oxygen, water

Q. During bioluminescence, energy is converted to energy.

1. light
2. heat
3. chemical
4. sound

Q. Match the following process with their types.

1. Endothermic
2. Exothermic
3. Photochemical

Q.

Sodium hydroxide reacting with hydrochloric acid to give salt and water is an example of _____________.

1. photochemical reaction

2. thermochemical reactions

3. neutralisation reaction

4. electrochemical reaction

Q. The chemical reactions which are initiated by are called photochemical reactions.

1. light
2. heat
3. electricity

Q. The chemical reactions which are initiated by are called photochemical reactions.

1. light
2. heat
3. electricity

Q.

Silver bromide undergoes photochemical decomposition to form:

1. Silver and Bromine

2. Silver only

3. Silver chloride

4. Bromine only