(D) In group $14$ elements,the stability of the $+2$ oxidation state increases down the group due to the inert pair effect. The inert pair effect is t

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(D) In group $14$ elements,the stability of the $+2$ oxidation state increases down the group due to the inert pair effect. The inert pair effect is the reluctance of the $ns^2$ electron pair to participate in bonding. As we move from $Si$ to $Pb$ $(Si Therefore,$Pb^{2+}$ is the most stable among the given options.