Which has maximum melting point?

LiCl

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NaCl

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KCl

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RbCl

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Solution

The correct option is B NaCl
Melting point of RbCl = $718^{o} C$
Melting point of KCl = $770^{o} C$
Melting point of NaCl = $801^{o} C$
Melting point of LiCl = $605^{o} C$

One would expect LiCl to have the highest melting point, following a certain trend. But NaCl has the highest melting point due to lesser disparity in size and hence a better crystal structure.

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