Account for the following:

(i) $N{F}_{3}$ is an exothermic compound but $NC{I}_{3}$ is an endothermic compound.

(ii) HF is not stored in glass bottles but is kept in wax-coated bottles.

(iii) Bleaching of flowers by $C{l}_{2}$ is permanent while that of $S{O}_{2}$ is temporary.

Concept Videos :-

#6 | 16th Group

Concept Questions :-

group 16,preparation and properties

(i) F is more electronegative than Cl.

The difference in the electronegativity between N and F is much more than the difference between       electronegativity of N and Cl. So there is need of much more energy to break the N-F bond.

(ii) HF is highly corrosive and etches glass hence it is kept in wax-coated bottles.

(iii) Chlorine bleaches the material by oxidation hence it is permanent while $S{O}_{2}$ bleaches the material by reduction and as the material is exposed to air, it gets oxidised and the colour is restored, hence it is temporary.

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