Potassium dichromate is preferred in the place of sodium dichromate in quantitative analysis for use as primary standard because

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Potassium dichromate is less soluble in water than sodium dichromate

Sodium dichromate is hygroscopic while potassium dichromate is not

Molecular mass of potassium dichromate is more than sodium dichromate

Potassium dichromate is weak oxidizing agent than sodium dichromate

answer is C.

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Detailed Solution

Sodium dichromate is hygroscopic and hence its weight increases during weighing for the preparation of standard solution. $K_{2} C r_{2} O_{7}$ is not hygroscopic.

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