Question

1 mol each of the following compounds is dissolved in 1L of solution. Which will have the largest ΔT_b value ?

(a) HF

(b) HCl

(c) HBr

(d) HI

Answer 1

Correct option (d) HI

Explanation:

Bond dissociation energy increases in the order : HI < HBr < HCl < HF

HF is most stable halogen acid and HI is the least.

Higher the bond dissociation energy' lower is the degree of ionisation.

As we know ΔT_b = iK_bm.

Hence  ΔT_b value is largest for HI. All colligative properties depend upon number of particles.