1.

The stability of dihaiides of Si, Ge, Sn and Pb increases steadlly in the sequence.

Answer»

`SiX_(2) lt lt GeX_(2) lt lt SnX_(2) lt lt PbX_(2)`
`PbX_(2) lt lt SnX_(2) lt lt GeX_(2) lt lt SiX_(2)`
`GeSX_(2) lt lt SiX_(2) lt lt SnX_(2) lt lt PbX_(2)`
`SiX_(2) lt lt GeX_(2) lt lt PbX_(2) lt lt SnX_(2)`

Solution :Due to the INERT PAIR effect (the reluctance of `NS^(2)` electrons of outermost SHELL to participate in bonding) the stability of `M^(2+)` IONS (of group 14 elements) increases as we go down the group.


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