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Q.

Arrange the following hydrides in the decreasing order of their basicities:   NH3,AsH3,SbH3,BiH3 and PH3

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a

NH3>AsH3>SbH3>BiH3>PH3

b

NH3>PH3>AsH3>SbH3≥BiH3

c

BiH3>SbH3>AsH3>PH3≥NH3

d

PH3>BiH3>SbH3>AsH3>NH3

answer is B.

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Detailed Solution

The decreasing order of the basicities is NH3>PH3>AsH3>SbH3≥BiH3This is because tendency to give lone pair decreases as the size of element of group - 15 increases.
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