Which of the statement is not true?

Options

A. On passing `H_(2)S` acidified `K_(2)Cr_(2)O_(7)` solution, a milky colour is observed
B. `Na_(2)Cr_(2)O_(7)` is preferred over `K_(2)Cr_(2)O_(7)` in volumetric analysis
C. `K_(2)Cr_(2)O_(7)` solution in acidic medium is orange
D. `K_(2)Cr_(2)O_(7)` solution becomes yellow on increasing the pH beyond 7

Answer

B

Explanation

`K_(3)Cr_(2)O_(7)` is prefered over `Na_(2)Cr_(2)O_(7)` since `K_(2)Cr_(2)O_(7)` is a primary standard.