1.

The H-N-H angle in ammonia is 107.6^(@), while the H-P angle in phosphineis 93.5^(@). Relative to phosphine, the p-character of the lone pair on ammonia is expected to be

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cannot be predicted

Solution :As bond ANGLE decreases, p- CHARACTER INCREASE.
`:.` Bond angle order `: NH_(3)gtPH_(3)`
`:.`p-character order: `NH_(3)ltPH_(3)`


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