Question

Assertion : K2Cr2O7 is used as primary standard in volumetric analysis.

Reason : It has a good solubility in water.

(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 correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

The correct option is (c) A is true but R is false.

Explanation:

K2Cr2O, is less soluble in water. K2Cr2O7 can be found in pure state and can be accurately weighed. It is not hygroscopic in nature. So, K2Cr2O7 is used as a primary standard solution.