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Bond angle in NH(3) is more than in PH(3...

Bond angle in `NH_(3)` is more than in `PH_(3).` Explain.

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The electron pair density on the smaller .N. atom is more than the larger .P. atom. Electron donation is more for .N. of `NH_(3)` compared to .P. to `PH_(3)`. Therefore `PH_(3)` is a weaker Lewis base than `NH_(3)`.
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