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 ${Cu}^{+}$ .

Question

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}^{+}

.

Quantrex Academy · Accepted Answer

Correct answer: A. Both (A) and (R) are correct and (R) is the correct explanation of (A).

2 Cu ^ + → Cu ^ 2 + + Cu The stability of Cu ^ 2 + ( aq ) rather than Cu ^ + ( aq ) , is due to the much more negative ∆ _ hyd H of Cu ^ 2 + ( aq ) than Cu ^ + ( aq ) , which more than compensates for the second ionisation enthalpy of Cu . Hence, both (A) and (R) are correct and (R) is the correct explanation of (A).

Given below are two statements : one is labelled as Assertion (A)...

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