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Q.

Amongst sodium halides (NaF, NaCl, NaBr and NaI), NaF has the highest melting point because of :

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a

High oxidising power

b

Lowest polarity

c

Maximum lattice energy

d

Minimum ionic character

answer is C.

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Detailed Solution

Melting point of ionic salts ∝ Lattice energy (having monoatomic cation and anion). Lattice energy ∝qC+⋅qA−rC++rA−Order of melting point : NaF > NaCl > NaBr > NaI
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Amongst sodium halides (NaF, NaCl, NaBr and NaI), NaF has the highest melting point because of :