Ncert Exercises & Solutions

The coloured compound among the following in the solid state is:
1. \( \mathrm{Ag}_{2} \mathrm{SO}_{4} \)
2. \(\mathrm {C u F}_{2} \)
3. \(\mathrm {Zn F}_{2} \)
4. \(\mathrm{Cu}_{2} \mathrm{Cl}_{2} \)

Hint: If unpaired electron is present in the central atom then it will show coloured

Transition elements form coloured salt due to the presence of unpaired electrons.

In Ag₂SO₄, Ag oxidation state is +1. It is a d¹⁰ system, does not contains unpaired electron hence, does not show any colour.

In ZnF₂ , Zn oxidation state is +2. It is a d¹⁰ system, does not contains unpaired electron hence, does not show any colour.

InCu₂Cl₂, Cu oxidation state is +1. It is a d¹⁰ system, does not contains unpaired electron hence, does not show any colour.

In CuF₂

{^{}}_{}

, Cu oxidation state is +2. It is a d⁹ system, and contains one unpaired electron hence,

C u F_{2}

, is coloured in solid state.

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