Assertion A: in water is more stable than . Reason R: Enthalpy of hydration for is much less than that of . [2023]

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Q.
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: ${Cu}^{2 +}$ in water is more stable than ${Cu}^{+}$ .

Reason R: Enthalpy of hydration for ${Cu}^{2 +}$ is much less than that of ${Cu}^{+}$ .

In the light of the above statements, choose the correct answer from the options given below: [2023]

1 Both (A) and (R) are correct and (R) is the correct explanation of (A)

2 (A) is correct but (R) is not correct

3 Both (A) and (R) are correct but (R) is not the correct explanation of (A)

4 (A) is not correct but (R) is correct

Ans.
(2)

In aqueous solution, ${Cu}^{+ 1}$ is unstable and it disproportionates.

$2 {Cu}^{+ 1} ⟶ Cu (s) + {Cu}^{+ 2} (a q)$

Hydration energy of ${Cu}^{2 +}$ is higher than ${Cu}^{+ 1}$ and this compensates its ionisation energy.

Solution

1 Both (A) and (R) are correct and (R) is the correct explanation of (A)

2 (A) is correct but (R) is not correct

3 Both (A) and (R) are correct but (R) is not the correct explanation of (A)

4 (A) is not correct but (R) is correct

Ans.
(2)

In aqueous solution, ${Cu}^{+ 1}$ is unstable and it disproportionates.

$2 {Cu}^{+ 1} ⟶ Cu (s) + {Cu}^{+ 2} (a q)$

Hydration energy of ${Cu}^{2 +}$ is higher than ${Cu}^{+ 1}$ and this compensates its ionisation energy.

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Solution

1 Both (A) and (R) are correct and (R) is the correct explanation of (A)

2 (A) is correct but (R) is not correct

3 Both (A) and (R) are correct but (R) is not the correct explanation of (A)

4 (A) is not correct but (R) is correct

Ans. (2) In aqueous solution, Cu+1 is unstable and it disproportionates. 2Cu+1⟶Cu(s)+Cu+2(aq) Hydration energy of Cu2+ is higher than Cu+1 and this compensates its ionisation energy.

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Ans.
(2)

In aqueous solution, ${Cu}^{+ 1}$ is unstable and it disproportionates.

$2 {Cu}^{+ 1} ⟶ Cu (s) + {Cu}^{+ 2} (a q)$

Hydration energy of ${Cu}^{2 +}$ is higher than ${Cu}^{+ 1}$ and this compensates its ionisation energy.