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

$N{a}_{2}C{r}_2{O}_7$ is not preferred over $K_{2}C{r}_2{O}_7$ in volumetric analysis because former is hygroscopic in nature and accurate weighing is difficult and standard solution can not be prepared in normal atmospheric conditions.