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Q.

What is the basicity order of hydrides of 15th Group ?

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a

NH3>PH3>AsH3>SbH3>BiH3

b

NH3SbH3

c

NH3

d

NH3>PH3

answer is A.

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Detailed Solution

If the donor atom belongs to the same group, then basicity decreases down the group. As the size of the lone pair containing orbital increases, lone pair gets stabilized and tendency to donate decreases.
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