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01/10/2020 8:47 pm
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1 mol each of the following compounds is dissolved in 1L of solution. Which will have the largest ΔTb value?
(a) HF
(b) HCl
(c) HBr
(d) HI
1 Answer
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01/10/2020 8:49 pm
(d) HI
Explanation:
The value of ΔTb depends upon two factors 'i' and 'm'. It is given that 1 mol of each compound is dissolved in 1 L of solution. Hence molarity is same for all the compounds. Now the van't Hoff factor depends on number of particle i.e. on degree of ionisation which further depends on the bond dissociation energy which is in the order
HI < HBr < HCl < HF
i.e., bond dissociation energy of HI is least. Lower the bond dissociation energy, higher is the degree of ionisation and hence higher the number of particles, thus i will be maximum for HI and hence ΔTb value will be larger for HI.