Which of the following statements is not true?
- A$K_2Cr_2O_7$ solution in acidic medium is orange
- B$K_2Cr_2O_7$ solution becomes yellow on increasing the $pH$ beyond $7$
- COn passing $H_2S$ through acidified $K_2Cr_2O_7$ solution,a milky colour is observed
- D$Na_2Cr_2O_7$ is preferred over $K_2Cr_2O_7$ in volumetric analysis
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