The stability of dihalides of Si, Ge, Sn, and Pb increases steadily in the sequence
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a
PbX2
b
GeX2
c
SiX2
d
SiX2
answer is D.
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Detailed Solution
Due to the inert pair effect (the reluctance of ns2 electrons of outermost shell to participate in bonding) the stability of M2+ions (of group IV elements) increases as we go down the group