Which compound is not easily purified by recrystallisation?

K N O_{3}

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K B r

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N a C l

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C a {(O H)}_{2}

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Solution

The correct option is C $N a C l$
A compound which has different solubility at lower temperature and higher temperature can be easily purified by recrystallization.
NaCl has same solubility at given temperature range. Hence, it cannot be easily purified by recrystallization.

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N a N O_{3}

K N O_{3}

N a N O_{3} (a q) + K C l (a q) ⇌ K N O_{3} (a q) + N a C l (s)

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