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The correct option(s) to distinguish nitrate salts of M n 2 + and C u 2 + taken separately is (are) (1) M n 2 + shows the characteristic green colour in the flame test (2) only C u 2 + shows the formation of precipitate by passing H 2 S in acidic medium (3) only M n 2 + shows the formation of precipitate by passing H 2 S in faintly basic medium (4) Cu 2 + | Cu has higher reduction potential than Mn 2 + | Mn (measured

Options

  1. A1, 2
  2. B1, 3
  3. C2, 4
  4. D1, 2, 4

Correct answer

C. 2, 4

Step-by-step solution

A Manganese show pale purple colour in flame test. B C u 2 + → H 2 S H C l C u S ↓ Black ppt. C Both C u 2 + and M n 2 + form precipitate with H 2 S in basic medium. D E Cu 2 + | Cu o = + 0.34 V , E Mn 2 + | Mn o = − 1.18 V

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