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Q.

Which of the following has lowest boiling point?

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a

CuCl2

b

CsCl

c

NaCl

d

CuCl

answer is C.

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Detailed Solution

According to Fajan’s rule, as the size of cation decreases, its polarising power increases. Hence, Cu2+ polarise Cl- ions more than Cu+. Therefore, CuCl2 has more covalent character and hence, its boiling point is less.

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