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Among Fe³⁺ , Pb²⁺ , Cu²⁺ and Mn²⁺ , identify the one that gets precipitated out while passing H₂S in presence of NH₄OH as group reagent. The highest possible oxidation state of the corresponding metal is

Options

  1. A+3
  2. B+4
  3. C+2
  4. D+7

Correct answer

D. +7

Step-by-step solution

The group reagent H₂S in the presence of NH₄OH is used for the precipitation of Group IV cations in qualitative analysis. Among the given ions, Mn²⁺ belongs to Group IV and is precipitated as MnS . Pb²⁺ and Cu²⁺ belong to Group II and are precipitated by H₂S in an acidic medium. Fe³⁺ belongs to Group III and is precipitated as Fe(OH)₃ by NH₄OH in the presence of NH₄Cl . The metal corresponding to the precipitated ion is Manganese ( Mn ). The electronic configuration of Mn is [Ar] 3d^5 4s^2 . By losing all its valen

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