Assertion (A): In a redox reaction, the electron gaining species acts as a reducing agent.

Reason (R): Oxidation and reduction reactions occur simultaneously in redox reaction.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): The decomposition of vegetable matter into compost is an endothermic reaction.

Reason (R): Decomposition reactions involve the breakdown of a single reactant into simpler products.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): Chlorine can displace iodide ions from KI solution.

Reason (R): It is an example of displacement reaction.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): Silver is displaced by copper from the aqueous solution of silver nitrate.

Reason (R): Copper is placed below silver in the activity series.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.