The electronic configuration of Cu(II) is whereas that of Cu(I) is . Which of the following is correct?

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Q.
The electronic configuration of Cu(II) is $3 d^{9}$ whereas that of Cu(I) is $3 d^{10}$ . Which of the following is correct [2024]

1 Cu(I) and Cu(II) are equally stable

2 Cu(II) is less stable

3 Cu(II) is more stable

4 Stability of Cu(I) and Cu(II) depends on nature of copper salts.

Ans.
(3)

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

Solution

Q.
The electronic configuration of Cu(II) is $3 d^{9}$ whereas that of Cu(I) is $3 d^{10}$ . Which of the following is correct [2024]

1 Cu(I) and Cu(II) are equally stable

2 Cu(II) is less stable

3 Cu(II) is more stable

4 Stability of Cu(I) and Cu(II) depends on nature of copper salts.

Ans.
(3)

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

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Solution

Q. The electronic configuration of Cu(II) is 3d9 whereas that of Cu(I) is 3d10. Which of the following is correct [2024]

1 Cu(I) and Cu(II) are equally stable

2 Cu(II) is less stable

3 Cu(II) is more stable

4 Stability of Cu(I) and Cu(II) depends on nature of copper salts.

Ans. (3) The stability of Cu2+ (aq) rather than Cu+ (aq) is due to the much more negative ∆Hhyd of Cu2+ (aq) than Cu+ (aq), which more than compensates for the second ionisation enthalpy of Cu.

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Q.
The electronic configuration of Cu(II) is $3 d^{9}$ whereas that of Cu(I) is $3 d^{10}$ . Which of the following is correct [2024]

Ans.
(3)

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