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Which of the following statements is false ?

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${Cr}_{2} O_{7}^{- 2} has a Cr - O - Cr bond$

${CrO}_{4}^{- 2} is tetrahedral in shape$

${Na}_{2} {Cr}_{2} O_{7} is a primary standard in volumetric analysis .$

${Na}_{2} {Cr}_{2} O_{7} is less soluble than K_{2} {Cr}_{2} O_{7}$

answer is C.

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The weight of ${Na}_{2} {Cr}_{2} O_{7}$ is not accurately measured.

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