The basic character of hydrides of the V-group elements decreases in the order

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SbH3>PH3>AsH3>NH3

NH3>SbH3>PH3>AsH3

NH3>PH3>AsH3>SbH3

SbH3>AsH3>PH3>NH3

answer is C.

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Detailed Solution

NH3>PH3>AsH3>SbH3On moving down the group atomic size increases and availability of lone pair decreases. Hence, basic character decreases.

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