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Assertion: $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ is used as primary standard in volumetric analysis.
Reason : It has a good solubility in water.
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Reason : It has a good solubility in water.
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The correct answer is:
If assertion is true but reason is false.
$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ is less soluble in water. It can be found in pure state and can be accurately weighed. It is not hygroscopic in nature. So, $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ is used as a primary standard solution.
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