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99 Percentile Qs Bank for JEE MainChemistryd and f Block Elements

Ferrous ion charges to X ion, on reacting with acidified hydrogen peroxide. The number of d -electrons present in X and its magnetic moment (in BM) are, respectively :

Options

  1. A6 and 6.93
  2. B5 and 5.92
  3. C5 and 4.9
  4. D4 and 5.92

Correct answer

B. 5 and 5.92

Step-by-step solution

Ferrous ion ( Fe ²⁺ ) changes to ferric ion Fe ³⁺ on reacting with acidified H ₂ O ₂ as 2 ~K ₄ [ Fe ( CN )₆ ]+ H ₂ SO ₄+ H ₂ O ₂ 2 ~K ₃ [ Fe ( CN )₆ ]+ K ₂ SO ₄+2 H ₂ O Electronic configuration of Fe ³⁺=1 s^2, 2 s^2, 2 p^6, 3 s^2, 3 p^6, 3 d^5 Number of d electrons =5 Magnetic moment = n(n+2) = 5(5+2) =5.92 BM

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