JEE Main 2023 — Chemistry Inorganic Chemistry

2023mcqmedium

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

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

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

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

Official previous-year question

Held on 1 Feb 2023 · Verified 6 Jul 2026.

Options

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

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Solution

$2{\mathrm{Cu}}^{+}\rightarrow {\mathrm{Cu}}^{2+}+\mathrm{Cu}$

The stability of ${\mathrm{Cu}}^{2+}(\mathrm{aq})$ rather than ${\mathrm{Cu}}^{+}(\mathrm{aq})$ , is due to the much more negative ${\Delta }_{\mathrm{hyd}}H$ of ${\mathrm{Cu}}^{2+}(\mathrm{aq})$ than ${\mathrm{Cu}}^{+}(\mathrm{aq})$ , which more than compensates for the second ionisation enthalpy of $\mathrm{Cu}$ .

Hence, both (A) and (R) are correct and (R) is the correct explanation of (A).

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Solution

$2{\mathrm{Cu}}^{+}\rightarrow {\mathrm{Cu}}^{2+}+\mathrm{Cu}$

Hence, both (A) and (R) are correct and (R) is the correct explanation of (A).

JEE Main 2023 — Chemistry Inorganic Chemistry

Options

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Solution

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JEE Main Inorganic Chemistry in other years

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JEE Main 2023 — Chemistry Inorganic Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Inorganic Chemistry in other years

More JEE Main Inorganic Chemistry questions

Other Chemistry topics for JEE Main

Physical Chemistry

Organic Chemistry

Keep practicing Inorganic Chemistry