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Which of the following statements about potassium dichromate is correct?

1. An acidified K2Cr2O7 solution liberates iodine from KI
2. K2Cr2O7 is used as a primary standard for the estimation of Fe2+ ions
3. In acidic medium the equivalent weight of K2Cr2O7 equals M/6 (where M is its molar mass)
4. All of the above statements are correct

Correct answer: All of the above statements are correct

Solution

Acidified dichromate oxidises iodide to iodine and Fe2+ to Fe3+, it is a primary standard, and since it accepts 6 electrons its equivalent weight is M/6 (the question's 'N/6' should read M/6); all three statements are correct.

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