Assertion (A) Redox couple is the combination of oxidised and reduced form of a substance involved in an oxidation or reduction half cell
Reason ( R) In the representation `E_(Fe^(-3+)//Fe^(2+))^(ϴ)` and `E_(Cu^(2+)//Cu)^(ϴ), Fe^(3+)//Fe^(2+)` and `Cu^(2+)//Cu` are redox couples

Options

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not the correct explanation of A
C. A is true but R is false
D. Both A and R are false

Explanation

To solve the question, we need to analyze both the assertion (A) and the reason (R) provided in the question.

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states: "Redox couple is the combination of oxidized and reduced form of a substance involved in an oxidation or reduction half cell."
- A redox couple indeed consists of two species: one in its oxidized form and the other in its reduced form. This pair participates in redox reactions, where one species gets oxidized (loses electrons) and the other gets reduced (gains electrons).

2. **Understanding the Reason (R)**:
- The reason states: "In the representation `E_(Fe^(-3+)//Fe^(2+))^(ϴ)` and `E_(Cu^(2+)//Cu)^(ϴ)`, `Fe^(3+)//Fe^(2+)` and `Cu^(2+)//Cu` are redox couples."
- This representation shows the standard electrode potentials of the redox couples. Here, `Fe^(3+)` and `Fe^(2+)` form a redox couple, as do `Cu^(2+)` and `Cu`. Each pair consists of an oxidized form and a reduced form.

3. **Evaluating the Truth of A and R**:
- Both the assertion and the reason are true statements. The assertion correctly defines what a redox couple is, and the reason provides valid examples of redox couples.

4. **Determining the Relationship Between A and R**:
- The reason (R) correctly explains the assertion (A) by providing specific examples of redox couples that fit the definition given in the assertion.

5. **Conclusion**:
- Since both A and R are true, and R is the correct explanation of A, the correct answer is: **Both A and R are true, and R is the correct explanation of A.**

### Final Answer:
Both A and R are true, and R is the correct explanation of A.

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