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Q.

Which of the following reaction involves the liberation of energy?

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a

Na(s)→Na(g)+

b

Cl2(g)→2Cl(g)

c

Na(g)++Cl(g)-→NaCl(s)

d

NaCl(s)→Na(g)++Cl(g)-

answer is C.

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Detailed Solution

1 Na(s)→I Sublimation Na(g)→II Ionization Na+(g)I & II are endothermic2 Cl2(g)→ Bond dissociation energy III2Cl(g)III is endothermic3 Na+(g)+Cl-(g)→IVL.ENaCl(s)IV is exothermic, lattice enthalpy is the energy released when gaseous cation and anion combine to form one mole of ionic crystal

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