In the standardisation of using by iodometry

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Problem

In the standardisation of

\text{Na}_2\text{S}_2\text{O}_3

using

\text{K}_2\text{Cr}_2\text{O}_7

by iodometry, the equivalent mass of

\text{K}_2\text{Cr}_2\text{O}_7

is: (1)

M/2

(2)

M/6

(3)

M/3

(4)

M