Assertion : Anhydrous $M g C l_{2}$ is prepared by heating $M g C l_{2} . 6 H_{2} O$ in a current of $H C l$ gas
Reason : Presence of $H C l$ gas checks up the hydrolysis of $M g C l_{2}$ by its water of crystallization

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

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Both Assertion and Reason are true and Reason is not the correct explanation of Assertion

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Assertion is true but Reason is false

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Assertion is false but Reason is true

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Solution

The correct option is A Both Assertion and Reason are true and Reason is the correct explanation of Assertion
On direct heating of $M g C l_{2} .6 H_{2} O$ , anhydrous $M g C l_{2}$ is not obtained due to its hydrolysis so hydrated $M g C l_{2}$ is heated in a vacuum in a current of dry $H C l$ gas and $M g C l_{2}$ is formed.

So, anhydrous $M g C l_{2}$ is prepared by heating $M g C l_{2} . 6 H_{2} O$ in a current of $H C l$ gas and presence of HCl gas checks up the hydrolysis of $M g C l_{2}$ by its water of crystallization.

Option A is correct.

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Assertion : Anhydrous MgCl2 is prepared by heating MgCl2.6H2O in a current of HCl gasReason : Presence of HCl gas checks up the hydrolysis of MgCl2 by its water of crystallization

Assertion : Anhydrous $M g C l_{2}$ is prepared by heating $M g C l_{2} . 6 H_{2} O$ in a current of $H C l$ gas
Reason : Presence of $H C l$ gas checks up the hydrolysis of $M g C l_{2}$ by its water of crystallization