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JEE Main202125 Feb 2021Morning ShiftChemistryRedox ReactionsActual

In basic medium CrO 4 2 - oxidises S 2 O 3 2 - to form SO 4 2 - and itself changes into Cr OH 4 - .The volume of 0 . 154 MCrO 4 2 - required to react with 40 mL of 0 . 25 MS 2 O 3 2 - is _____ mL . (Rounded-off to the nearest integer)

Correct answer

0

Step-by-step solution

CrO 4 2 - + S 2 O 3 2 - → SO 4 2 - + Cr OH 4 + 3 gm equi. of CrO 4 2 - = S 2 O 3 2 - 0 . 154 × 3 × v = 0 . 25 × 40 × 8 v = 173 . 16 = 173 ml Hence answer is 173

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