[Na2Cr2] Which of the statements is not true?

For Competitive Exams

Which of the statements is not true?

K₂Cr₂O₇ solution in acidic medium is orange

K₂Cr₂O₇ solution becomes yellow on increasing the pH beyond 7

On passing H₂S through acidified K₂Cr₂O₇ solution, a milkycolour is observed

Na₂Cr₂O₇ is preferred over K₂Cr₂O₇ in volumetric analysis

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