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In basic medium, CrO(4)^(2-) oxidises S(...

In basic medium, `CrO_(4)^(2-)` oxidises `S_(2)O_(3)^(2-)` to form `SO_(4)^(2-)` and itself changes to `Cr(OH)_(4)^(-)`. How many mL of 0.154M `CrO_(4)^(2-)` are required to react with 40mL of 0.308 M `S_(2)O_(3)^(2-)`?

A

213mL

B

156.4mL

C

170.4mL

D

190.4mL

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The correct Answer is:
a
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In basic medium CrO_4^(2-) oxidises S_2O_3^(2-) to form SO_4^(2-) and itself changes into Cr(OH)_4^(-) . The volume of 0.154 M CrO_4^(2-) required to react with 40 mL of 0.25 M S_2O_3^(2-) is "___" mL.

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