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As(2)S(3)+7NaClO(3)+12NaOHrarr2Na(3)AsO(...

`As_(2)S_(3)+7NaClO_(3)+12NaOHrarr2Na_(3)AsO_(4)+7NaClO+3Na_(2)SO_(4)+6H_(2)O`
The equivalent weight of `As_(2)S_(3)` is

A

`(M)/(24)`

B

`M`

C

`(M)/(2)`

D

`(M)/(28)`

Text Solution

Verified by Experts

The correct Answer is:
D
Both `As_(2)^(+3xx2)` and `S_(3)^(-2xx3)` undergo oxidation.
`As_(2)^(+3xx2)rarr2AsO_(4)^(3-)+4e^(-)`(oxidation)
`2x= +6, 2x-16= -6`
`2x=10`
`S_(3)^(-2xx3)rarr3SO_(4)^(2-)+24e^(-)`(oxidation)
`3x= -6, 3x-24= -6`
`3x=18`
Total `e^(-)= 24+4=28`
`Ew=(M)/(28)`
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