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Na2Cr2O7 is hygroscopic in nature and therefore accurate weighing is not possible in normal atmospheric conditions. A hygroscopic substance absorbs moisture from atmosphere and this could lead to inaccuracies in weight.

1. Na2Cr2O7 absorbs moisture and forms Na2Cr2O7·2H2O.
2. Na2Cr2O7 absorbs moisture and forms Na2Cr2O7·H2O.
3. Na2Cr2O7 absorbs moisture and forms Na2Cr2O7·3H2O.
4. Na2Cr2O7 absorbs moisture and forms Na2Cr2O7·4H2O.

Correct answer: Na2Cr2O7 absorbs moisture and forms Na2Cr2O7·2H2O.

Solution

Na2Cr2O7 is hygroscopic and absorbs moisture to form Na2Cr2O7·2H2O, which is its dihydrate form. This property makes accurate weighing difficult under normal atmospheric conditions.

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