Which of the following is not a sulphate ore of Mg ?

Dolomite

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Carnallite

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Magnesite

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Kieserite

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Solution

The correct options are
A Dolomite
B Carnallite
D Magnesite
Dolomite: $C a M g (C O_{3})_{2}$

Carnallite: $K M g C l_{3} \cdot 6 (H_{2} O)$

Magnesite: $M g C O_{3}$

Kieserite: $M g S O_{4} . H_{2} O$

Therefore, sulphate ore of Mg is Kieserite: $M g S O_{4} . H_{2} O$ .

Hence, A, B & C are correct.

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