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Q.

Among the 15^thgroup elements, as we move from nitrogen to bismuth, the pentavalence becomes less pronounced and tri valence becomes more pronounced due to Inert pair effect.

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a

Inert pair effect

b

High electronegativity

c

Non metallic character

d

Large ionization energy

answer is B.

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Detailed Solution

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According to Inert pair effect, as we move down the group stability of +5(higher) oxidation state decreases and +3(lower) oxidation state increases.

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Among the 15th group elements, as we move from nitrogen to bismuth, the pentavalence becomes less pronounced and tri valence becomes more pronounced due to Inert pair effect.