Which of the following statements is not true | vedclass

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(B) . Passing $H_2S$ through acidified $K_2Cr_2O_7$ produces $S$ (sulfur) which causes a milky appearance. This is true.$B$. $Na_2Cr_2O_7$ is more sol

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$Na_2Cr_2O_7$ is preferred over $K_2Cr_2O_7$ in volumetric analysis.

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(B) . Passing $H_2S$ through acidified $K_2Cr_2O_7$ produces $S$ (sulfur) which causes a milky appearance. This is true.$B$. $Na_2Cr_2O_7$ is more soluble than $K_2Cr_2O_7$,but it is hygroscopic,making it unsuitable for primary standards in volumetric analysis. Thus,$K_2Cr_2O_7$ is preferred. This statement is false.$C$. $K_2Cr_2O_7$ exists as dichromate ions in acidic medium,which are orange. This is true.$D$. In basic medium $(pH > 7)$,dichromate ions $(Cr_2O_7^{2-})$ convert to chromate ions $(CrO_4^{2-})$,which are yellow. This is true.

Which of the following statements is not true?

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