The chromate ion present in water sample is reduced to insoluble chromium hydroxide , `Cr(OH)_(3)` by dithionation, in basic sol

The chromate ion present in water sample is reduced to insoluble chromium hydroxide , `Cr(OH)_(3)` by dithionation, in basic solution .
`S_(2)O_(4)^(2-) + CrO_(4)^(2-) + 2H_(2)O to 2SO_(3)^(2-) + Cr(OH)_(3)+ OH^(-)`
100 L of water requires 387 g of `Na_(2)S_(2)O_(4)` . The molarity of `CrO_(4)^(2-)` in waste water is
A. 0.0448
B. 4.448
C. 0.0148
D. 0.0224

The chromate ion present in water sample is reduced to insoluble chromium hydroxide , `Cr(OH)_(3)` by dithionation, in basic solution . `S_(2)O_(4)^(2

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