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JEE Main202117 Mar 2021Morning ShiftChemistryRedox ReactionsActual

15   mL of aqueous solution of Fe 2 + in acidic medium completely reacted with 20   mL of 0 . 03   M aqueous Cr 2 O 7 2 - . The molarity of the Fe 2 + solution is _______ × 10 - 2 M (Round off to the Nearest Integer).

Correct answer

0

Step-by-step solution

n eq Fe 2 + = n eq Cr 2 O 7 2 - or 15 × M Fe 2 + 1000 × 1 = 20 × 0 . 03 1000 × 6 ∴ M Fe 2 + = 0 . 24 M = 24 × 10 - 2 M

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