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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+Cl−g→ NaCls

b

Nas→ Nag

c

Cl2g→ 2Clg

d

Nag+Clg→ Na+g+Cl−g

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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