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JEE Main202125 Jul 2021Morning ShiftChemistryRedox ReactionsActual

When 10   mL of an aqueous solution of Fe 2 + ions was titrated in the presence of dil H 2 SO 4 using diphenylamine indicator, 15   mL of 0 . 02   M solution of K 2 Cr 2 O 7 was required to get the end point. The molarity of the solution containing Fe 2 + ions is x × 10 - 2   M . The value of x is ______. (Nearest integer)

Correct answer

0

Step-by-step solution

milli-equivalents of Fe 2 + = milli-equivalents of K 2 Cr 2 O 7 M × 10 × 1 = 0 . 02 × 15 × 6 M = 0 . 18 = 18 × 10 - 2   M

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