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The number of electron-rich hydrides amo...

The number of electron-rich hydrides among the following is .........
`CH_(4), NH_(3), PH_(3),H_(2)O, H_(2)S, BH_(3),, HF, AlH_(3), AsH,_(3)`

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The correct Answer is:
6
`NH_(3), PH_(3),H_(2),O, H_(2),S, HF` and `AsH_(3)` , are electron-rich hydrides due to the presence of lone pairs of electrons, so these are expected to behave as Lewis bases. `CH_(4), BH_(3)`, and `AIH_(3)` , are electron-deficient hydrides.
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