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

1. CaSO4
2. MgSO4
3. Na2SO4
4. MgCl2

Correct answer: Na2SO4

Solution

Crude sodium chloride obtained from brine typically contains impurities like CaSO4, MgSO4, and MgCl2, but not Na2SO4, as sodium sulfate is not a common impurity in this process.

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