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Which of the following statements is false ?

$\begin{array}{1 1} CrO+4^2 \;is\;tetrahedral \;i\;shape \\ Cr_2O_7^{2-}\;has\;a\;Cr-O-Cr\;bond \\Na_2Cr_2O_7 \;is\;a\;primary\;standard \;in\;volumetry \\ Na_2Cr_2O_7\;is\;less\;soluble \;than\;K_2Cr_2O_7 \end{array} $

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