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Which of the statements is not true?

1. On passing H2S through acidified K2Cr2O7 solution, a milky colour is observed.
2. Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis.
3. K2Cr2O7 solution in acidic medium is orange.
4. K2Cr2O7 solution becomes yellow on increasing the pH beyond 7.

Correct answer: Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis.

Solution

Na2Cr2O7 is not preferred over K2Cr2O7 in volumetric analysis because K2Cr2O7 is more stable and less hygroscopic, making it more suitable for precise measurements.

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