Assertion:- $N a_{2} C r_{2} O_{7}$ cannot be used as a primary standard in titrations.
Reason: - $N a_{2} C r_{2} O_{7}$ is hygroscopic in nature.

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Assertion is True, Reason is true: Reason is the correct explanation for Assertion.

Assertion is False, Reason is true.

Assertion is True, Reason is False.

Assertion is true Reason is true: Reason is not the correct explanation for Assertion.

answer is A.

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Detailed Solution

$N a_{2} C r_{2} O_{7}$ is hygroscopic and that is why, it is not used as a primary standard in volumetric analysis.

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