Ncert Exercises & Solutions

The electronic configuration of Cu(II) is $3 d^{9}$ whereas that of Cu(I) is $3 d^{10}$ , the correct statement about the aqueous solution of Cu(II) and Cu(I) among the following is:

1.	Cu(II) is more stable
2.	Cu(II) is less stable
3.	Cu(I) and Cu(II) are equally stable
4.	Stability of Cu(I) and Cu(II) depends on the nature of copper salts

Hint: Cu(II) has high hydration energy

Cu(II) is more stable than Cu(I). As it is known that, Cu(I) has

3 d^{10}

stable configuration while Cu(II) has

3 d^{9}

configuration. But Cu(II) is more stable due to greater effective nuclear charge of Cu(II)i.e., it hold 17 electrons instead of 18 in Cu(I). Cu(II) has high hydration energy than Cu(I) hence, Cu(II) is more stable than Cu(I).

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