1.

In basic medium , CrO_(4)^(2-)oxidize S_(2)O_(3)^(2-) to form SO_(4)^(2-) and itself changes to Cr(OH)_(4)^(-) How many ml of 0.154 M CrO_(4)^(2-)are required to react with 400 ml of 0.246 MS_(2)O_(3)^(2-)?

Answer»

`200ML `
`156.4ml`
`170.4ml`
`190.4ml`

Solution :`40 xx 0.246 xx 8 = V xx 0.154 xx 3 ("Meq. of" S_(2)O_(3)^(2-) = " Meq. of " CrO_(4)^(2-))`
`:.V = 170.4 ML`


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