Question

The bond dissociation energies of X₂, Y₂ and XY are in the ratio of 1 : 0.5 : 1. ΔH for the formation of XY is - 200 kJ mol^-1. The bond dissociation energy of X₂ will be 

(a) 200 kJ mol^-1 

(b) 100 kJ mol^-1

(c) 800 kJ mol^-1 

(d) 400 kJ mol^-1

Answer 1

The correct option is : (c) 800 kJ mol^-1 

Explanation:

Let B.E. of X, Y, and XY are x kJ mol^-1, 0.5x kJ mol^-1 and x kJ mol^-1 respectively.