Which of the following statements is false?
- A$Na_2Cr_2O_7$ is less soluble than $K_2Cr_2O_7$
- B$Na_2Cr_2O_7$ is a primary standard in volumetry
- C$CrO_4^{2-}$ is tetrahedral in shape
- D$Cr_2O_7^{2-}$ has a $Cr-O-Cr$ bond
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