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a
C
b
Si
c
Ge
d
Pb
answer is D.
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Detailed Solution
C forms many hydrides (open chain and closed chain) i.e CH4 ,C2H4, C2H6……..etcSi forms hydrides General formula SinH2n+2Ge forms hydrides and General formula GenH2n+2Pb forms only one Hydride i.e PbH2