Ncert Exercises & Solutions

Generally transition elements and their salts are coloured due to the presence of unpaired electrons in metal ions. Which of the following
compounds are coloured?

$(a) K M n O_{4}$

$(b) C e {(S O_{4})}_{2}$

$(c) T i C l_{4}$

$(d) C u_{2} C l_{2}$

Choose the correct option

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, d)

K M n O_{4}

is coloured due to the charge Warister and not because of ie presence of unpaired electrons. Similarly, oxidation state of Ce in Ce(S

O_{4})_{2}

is +4 with 4

f^{°}

electronic configuration, It is also coloured (yellow) due to charge transfer and not due to f - f transition.

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