Which of the following statement is not true

Options

A. On passing `H_2S` through acidified `K_2Cr_2O_7` solution, milky coloured is observed
B. `Na_2Cr_2O_7`, is preferred over `K_2Cr_2O_7`, in volumetric analysis
C. `K_2Cr_2O_7` solution in acidic medium is orange
D. `K_2Cr_2O_7` solution becomes yellow on increasing the pH beyond 7.

Answer

B

Explanation

Hint : `Na_2Cr_2O_7` is not preferred, in volumetric analysis because of its hygroscopic nature. Hence, it is difficult to prepare its standard solution. So, `K_2Cr_2O_7` is preferred in volumetric analysis as it is not hygroscopic.