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Pick the FALSE statement among the following:

1. Cr2O7²- contains a Cr-O-Cr bridge bond
2. CrO4²- has a tetrahedral shape
3. Na2Cr2O7 is used as a primary standard in volumetric analysis
4. K2Cr2O7 is less soluble in water than Na2Cr2O7

Correct answer: Na2Cr2O7 is used as a primary standard in volumetric analysis

Solution

Na2Cr2O7 is hygroscopic (deliquescent), so it cannot serve as a primary standard; K2Cr2O7 is used instead. The other statements are true.

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