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Question

Among the members of V A group (N, P, As, S band Bi), which of the following properties shows an increase as we go down from nitrogen to bismuth?

A
Stability of +3 oxidation state
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B
Reducing character of hybrides
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C
Electronegativity
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D
Acidic nature of the pentoxide
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Solution

The correct option is A Stability of +3 oxidation state
(1)Among the members of group 15 ,as we move down the group, the stability of +3 oxidation state increases due to inert pair effect pair effect is tendency of two Es in outmost s orbital to remain unshared this is due to penetration of electron to(n-1)Cl electron and becoming closer to the nuclear.
(2)Reducing character of hydrides of group15 elements increases in the order NH3<H3<AsH3<sbH3<BiH3 this is due to decrease in the thermal stability of hydrides as we move down the group because of increase in the size of the central atom.

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