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