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PbX2 is more stable than PbX4 (X = CI, B...

`PbX_2` is more stable than `PbX_4` (X = CI, Br, I). Account for it.

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In `PxX_2` oxidation state of lead is `+4` . Due to inert pair effect , `+2` oxidation state is more stable than `+4` oxidation state in `Pb`. Hence,`PbX_2` is more stable as compared to `PbX_4`.
`PbX_4 rarr PbX_2 + X_2`.
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