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Crude sodium chloride which is obtained by crystallisation of brine solution contains Na₂SO₄, CaSO₄, CaCl₂, and MgCl₂ are present as impurities in crude.

1. Na₂SO₄
2. CaSO₄
3. CaCl₂
4. MgCl₂

Correct answer: MgCl₂

Solution

Among the impurities listed, MgCl₂ is a common impurity in crude sodium chloride obtained from brine due to its solubility and presence in seawater.

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