Question

"Hi

Complete the following chemical equations: NaOH(aq) + Cl2(g)→ (Hot and conc.) XeF6(s) + H2O(l)→ How would you account for the following? The value of electron gain enthalpy with negative sign for sulphur is higher than that for oxygen. NF3 is an exothermic compound but NCl3 is endothermic compound. ClF3 molecule has a T-shaped structure and not a trigonal planar one.

Answer 1

(i) Due to smaller size of oxygen the electron cloud is distributed over a small region of space, making electron density high which repels the incoming electrons.

(ii) This is due to lower bond dissociation enthalpy of F2 than Cl2 and comparable size of fluorine and nitrogen.

(iii) ClF3 molecule has a T-shaped structure. This is due to presence of two lone pairs in the outer shell of chlorine in ClF3 molecule which repel the bond pairs.