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Oxidation Number Method

In the standa...

Question

In the standardization of $N a_{2} S_{2} O_{3}$ using $K_{2} C r_{2} O_{7}$ by iodometry, the equivalent mass of $K_{2} C r_{2} O_{7}$ is :

A

\frac{m o l a r m a s s}{2}

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B

\frac{m o l a r m a s s}{6}

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C

\frac{m o l a r m a s s}{3}

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D

same as molar mass

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Solution

The correct option is B $\frac{m o l a r m a s s}{6}$
$K_{2} C r_{2} O_{7} \to 2 C r^{+ 3}$
+6 +3
So, change in oxidation state of $K_{2} C r_{2} O_{7} = 6$
So, eq. wt of $K_{2} C r_{2} O_{7} = \frac{M}{6}$

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