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Question:

Arrange the following in the order of property indicated against each set:
a. HF, HCl, HBr, HI - increasing bond dissociation enthalpy
b. H₂O, H₂S, H₂Se, H₂Te - increasing acidic character

Solution:

(i) HI < HBr < HCl < HF
HF, HCl, HBr, HI - increasing bond dissociation enthalpy
(ii) Hydracids of VI group elements act as weak acids. The strength increases in the order H₂O < H₂S < H₂Se < H₂Te.