1.

The stability of dihalides of Si, Ge, Sn and Pb increase steadity in the sequence

Answer»

`PbX_(2)ltltSnX_(2)ltltGeX_(2)ltltSiX_(2)`
`GeX_(2)ltltSiX_(2)ltltSnX_(2)ltltPbX_(2)`
`SiX_(2)ltltGeX_(2)ltltPbX_(2)ltltSnX_(2)`
`SiX_(2)ltltGeX_(2)ltltSnX_(2)ltltPbX_(2)`

Solution :Reluctance of valence SHELL electrons to participate in bonding is called inert pair EFFECT. The stability of LOWER oxidation state (+2 for group 14 element_) increase on going down the group. So the correct order is
`SiX_(2)ltltGeX_(2)ltltSnX_(2)ltltPbX_(2)`


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