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Model Paper 6 — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETModel Paper 64 Marks
MCQ
Which salt is more stable in aqueous solution, $Cu ^{2+}$ salt or $Cu ^{+}$salt?
  • A
    $Cu ^{+}$
  • ✓
    $Cu ^{2+}$
  • C
    Both are equally stable
  • D
    None of the above
✓

Answer

Correct option: B.
$Cu ^{2+}$
(B)
The greater stability of $Cu ^{2+}( aq )$ rather than $Cu ^{+}$ (aq) is due to the much more negative $\Delta_{\text {hyd }} H$ of $Cu ^{2+}( aq )$ than $Cu ^{+}$, which more than compensates for the second ionisation enthalpy of Cu .

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