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Select the incorrect order according to their given properties.

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a

Strength of acidic nature of group-15 hydrides:

${SbH}_{3} > {AsH}_{3} > {PH}_{3} > {NH}_{3}$

b

Bond energy of Cl₂ is greater than Br₂.

c

Order of stability of BiI₅ is more than BiI₃.

d

Bond angle of O-N-O angle:

${NO}_{2}^{-} < {NO}_{3}^{-} < {NO}_{2}$

answer is C.

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Detailed Solution

The inert pair effect is the unwillingness of the s-electrons to participate in bonding. This effect is majorly seen in heavier metals where s-electrons show inertness and do not involve in bonding with the other elements. Bi belongs to Group-15 and show two oxidation states: +3 and +5. Due to the inert pair effect, Bi stable in +3 than +5. Therefore BiI₃ is more stable than BiI₅.

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