1.

The number of modes of As_(2)S_(3) oxidised to H_(3)AsO_(4) " and "H_(2)SO_(4)by one mode of HNO_(3) (reduced to NO) is .

Answer»

`3/2`
`5/2`
`2/3`
`3/28`

Solution :`{:((As^(3+))_(2) to 2As^(5+) + 4E),(ul((S^(2-))_(3) to 3S^(6+) + 24E)),([As_(2)S_(3) to 2As^(5+). + 3S^(6+) + 28e] xx 3),([N^(5+) + 3e to N^(2+) ] xx 28):}`
` :. ` 28 mole of `HNO_(3)` oxidises 3 mol `As_(2)S_(3)`.


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