Question

Which of the statements is not true?

• A. $K_{2}C{r}_2{O}_7$ solution in acidic medium is orange
• B. $K_{2}C{r}_2{O}_7$ solution becomes yellow on increasing the pH beyond 7
• C. On passing $H_{2}S$ through acidified $K_{2}C{r}_2{O}_7$ solution, a milky colour is observed
• D. $N{a}_{2}C{r}_2{O}_7$ is preferred over $K_{2}C{r}_2{O}_7$ in volumetric analysis

Answer 1

The correct option is D $N{a}_{2}C{r}_2{O}_7$ is preferred over $K_{2}C{r}_2{O}_7$ in volumetric analysis

Potassium dichromate is preferred over sodium dichromate in volumetric analysis, primarily because the latter is hygroscopic in nature and therefore, accurate weighing is not possible in normal atmospheric conditions.