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Assertion (A): Potassium dichromate is p...

Assertion (A): Potassium dichromate is preferred to `Na_(2)Cr_(2)O_(7)` for use in volumetric analysis (titrations)
Reason (R): `Na_(2)Cr_(2)O_(7)` is hygroscopic whilst the `K_(2)Cr_(2)O_(7)` is not
Which of the following is correct ?

A

Both A and R are true and R is the correct explanation of A

B

Both A and R are true but R is not the correct explanation of A

C

A is true but R is false

D

Both A and R are false

Text Solution

Verified by Experts

The correct Answer is:
A
For quantitative analysis, `Na_(2)Cr_(2)O_(7)` can't be used as a primary standard becaused of its deliquescence. However, `K_(2)Cr_(2)O_(7)` is an ideal primary standard because it does not hydrate and because it can be obtained in high purity by recrystallization.
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