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Q.

A process can be Exothermic or Endothermic. Exothermic process of the following is 

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a

Na+g+Clg NaCls

b

Cl2g 2Clg

c

Nas Nag

d

Nag+Clg Na+g+Clg

answer is A.

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Detailed Solution

(1) is lattice enthalpy, the heat liberated when one mole of ionic solid is formed from its constituents gaseous ions.

Na+g+Cl-g NaCls,ΔHU=788kJ;

2nd option….sublimation….Endothermic;

3rd option…..atomization….Endothermic;

4th option…..invoves IP(endothermic= +492kJ/mole) and EGE(exothermic= -361kJ/mole)

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