Q54 / 180 · NEET 2019 (Odisha) · Chemistry

Crude sodium chloride obtained by crystallisation of brine solution does not contain

  • Correct answer
    A
    $\mathrm{MgSO}_4$
  • B
    $\mathrm{Na}_2 \mathrm{SO}_4$
  • C
    $\mathrm{MgCl}_2$
  • D
    $\mathrm{CaSO}_4$

Solution

Crude sodium chloride obtained by crystallisation of brine solution contains $\mathrm{CaSO}_4$, $\mathrm{Na}_2 \mathrm{SO}_4, \mathrm{CaCl}_2, \mathrm{MgCl}_2$ as impuirities. $\mathrm{CaCl}_2$ and $\mathrm{MgCl}_2$ are deliquescent, i.e. absorb moisture from atmosphere and give wet appearance to the salt. Crude salt is dissolved in water and insoluble impurities are removed by filtration. Hence, $\mathrm{MgSO}_4$ is not present in crude sodium chloride.

Hence, the correct answer is option: 'A'.

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