Answer:
(i) Due to inert pair effect, the +2
oxidation state of Pb is more stable than +4. Hence, \[Pb{{X}_{2}}\] is more
stable than \[Pb{{X}_{4}}\]. (ii) Stability of +4 oxidation state decreases
down the group while that of +2 oxidation state increases due to inert pair
effect. (iii) Same as (ii).
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