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Q.

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

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a

Potassium dichromate is less soluble in water than sodium dichromate

b

Sodium dichromate is hygroscopic while potassium dichromate is not

c

Molecular mass of potassium dichromate is more than sodium dichromate

d

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. K2Cr2O7  is not hygroscopic.

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