Which of the statements is not true?

Question

On passing H₂S through acidified K₂Cr₂O₇ solution, a milky colour is observed.

Na₂Cr₂O₇ is preferred over K₂Cr₂O₇ in volumetric analysis.

K₂Cr₂O₇ solution in acidic medium is orange.

K₂Cr₂O₇ solution becomes yellow increasing the pH beyond 7.

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