How would you account for the following :
(i) The electron gain enthalpy with negative sign is less for oxygen than that for sulphur.
(ii) Phosphorus shows greater tandency for catenation than nitrogen.
(iii) Fluorine never acts as the central atom in polyatomic interhalogen compounds.

(a) (i) Complete the following chemical equations : (i) NaOH_((aq))+Cl_(2(g)) rightarrow (Hot and conc.) (ii) Xef_(6)(s)+H_(2)O(l) rightarrow (b) How would you account for the following ? (i) The value of electron gain enthalpy with negative sign for sulphur is higher than that for oxygen. (ii) NF_(3) is an exothermic compound but NCl_(3) is endothermic compound. (iii) ClF_(3) molecule has a T-shaped structure and not a trigonal planar one.

Would you expect the second electron gain enthalpy of O as positive , more negative or less negative than the first? Justify your answer.

Would you expect the second electron gain enthalpy of O as positive, more negative or less negative than the first? Justify your answer.

Would you expect the second electron gain enthalpy of S as positive, more negative or less negative than the first? Justify your answer.

The electron gain enthalpy with negative sign for oxygen (-141 Kj mol^(-1)) is less than of sulphur (-200 kJ mol^(-1) Or The value of electron gain enthaply with negative sign for sulphur is higher than that of oxygen.

Account for the following : (i) NH_(3) is a stronger base than PH_(3) (ii) Sulphur has a greater tendency for catenation than oxygen. (iii) Bond dissociation energy of F_(2) is less than that of Cl_(2) .

(a) Draw the structures of the following : (i) XeF_(4) (ii) H_(2)S_(2)O_(7) (iii) SO_(3)^(2-) (b) Explain the following observations : (i) Phosphorous has a greater tendency for catenation than nitrogen. (ii) The negative value of electron gain enthalpy is less for fluorine than that for chlorine. (iii) Hydrogen fluoride has a much higher boiling point than hydrogen chloride.

(A) Complete the following chemical equations : (i) Cu+HNO_(3) (dilute) to (ii) XeF_(4)+O_(2)F_(2)to (B) Explain the following observations: (i) Phosphorous has greater tendency for catenation than nitrogen. (ii) Oxygen is a gas but sulphur is a solid. (iii) The halogens are coloured. Why ?

Assertion : The electron gain enthalpy of chlorine is less negative than that of fluorine. Reason : The fluorine atom is much smaller in size than that of chlorine.

Explain the following : (a) The electron gain enthalpy with negative sign for fluorine is less than for chlorine, still fluorine is a stronger oxidising agent than chlorine. (b) XeF_(2) is linear molecule without a bend. (c) NCl_(3) is an endothermic compound while NF_(3) is an exothermic one.