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Q.

The order of stability of oxides of VIIA group element;

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a

Bromine > lodine > Chlorine

b

Chlorine > lodine > Bromine

c

Chlorine > Bromine > lodine

d

lodine > Chlorine > Bromine

answer is A.

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Detailed Solution

  • The stability of oxides of iodine is greater than those of chlorine while bromine oxides are the least stable. 
  • Iodine-oxygen bond is stable due to greater polarity of the bond while the stability of the chlorine-oxygen bond is due to multiple bond formation involving d-orbitals of the chlorine atom. Bromine being in between lacks both these characteristics. Thus, the stability of oxides of halogens decreases in the order : I > Cl > Br > F.
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