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Correct decreasing order of reducing power in 15^th group hydrides is

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BiH₃>NH₃>SbH₃>AsH₃>PH₃

NH₃<PH₃<AsH₃<SbH₃<BiH₃

BiH₃<SbH₃<AsH₃<PH₃<NH₃

BiH₃>SbH₃>AsH₃>PH₃>NH₃

answer is D.

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Detailed Solution

All the hydrides of 15^th, 16^th & 17^thgroup are covalent

In 15^th, 16^th & 17^thgroup hydrides Down the group ,As the size of the atom increases ,

Affinity with Hydrogen decreases. Due to which (X=the central atom)

A) X-H bond enthalpy decreases

B)Thermal stability decreases

C) X-H bond length increases

D) Acidic strength increases

E) Reducing power increases

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