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

Vedclass · Accepted Answer

$Na_2Cr_2O_7$ 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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Choose the correct statements from the following:
$A$. $Mn_2O_7$ is an oil at room temperature.
$B$. $V_2O_4$ reacts with acid to give $VO^{2+}$ ions.
$C$. $CrO$ is a basic oxide.
$D$. $V_2O_5$ does not react with acid.
Choose the correct answer from the options given below:

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