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Assertion: K2Cr2O7 is used as primary st...

Assertion: `K_2Cr_2O_7` is used as primary standard in volumetric analysis.
Reason: It has a good solubility in water.

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Correct R. `K_(2)Cr_(2)O_(7)` is not much soluble in cold water. However , it is obtained in pure state and is not hygroscopic in nature.
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