Q.

Stability of ions of Ge, Sn and Pb will be in the order

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a

Ge2+

b

Ge4+>Sn4+>Pb4+

c

Sn4+>Sn2+

d

All are correct

answer is D.

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Detailed Solution

The element of group 14 has 4 valence electrons. Therefore, the oxidation state of the group is +4. However, as a result of the inert pair effect, the lower oxidation state becomes more stable and the higher oxidation state becomes less stable. Therefore, this group exhibits +4 and  +2 oxidation states.
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