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JEE Main20198 Apr 2019Morning ShiftChemistryRedox ReactionsActual

In order to oxidize a mixture of one mole of each of F e C 2 O 4 , F e 2 ( C 2 O 4 ) 3 , F e S O 4 and F e 2 ( S O 4 ) 3 in acidic medium, the number of moles of K M n O 4 is:

Options

  1. A1
  2. B2
  3. C3
  4. D1.5

Correct answer

B. 2

Step-by-step solution

E q . K M n O 4 ⇒ E q . F e S O 4 + E q . F e 2 S O 4 3 + E q F e C 2 O 4 + E q . F e 2 C 2 O 4 3 K M n O 4 ⇒ M n O 4 - 5 e - + 8 H + + M n O 4 - ⇒ M n + 2 + 4 H 2 O V.F = 5 So E q . K M n O 4 ⇒ E q . F e S O 4 + E q . F e C 2 O 4 + E q . F e 2 C 2 O 4 3 n × 5 = 1 × 1 + 1 × 0 + 1 × 3 + 1 × 6 n × 5 = 1 + 3 + 6 n = 10 5 = 2   m o l e

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