Hydrated magnesium chloride becomes anhydrous salt when it is heated:

with

P_{4} O_{10}

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with anhydrous

C a C l_{2}

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in dry

H C l

gas

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with conc.

H_{2} S O_{4}

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Solution

The correct option is D in dry $H C l$ gas
Anhydrous magnesium chloride can be prepared by heating $M g C l_{2} .2 H_{2} O$ in presence of dry HCl gas.

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