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The correct option(s) to distinguish nitrate salts of M n 2 + a n d C u 2 + taken separately is(are)

Options

  1. AM n 2 + shows the characteristic green colour in the flame test
  2. BOnly C u 2 + shows the formation of precipitate by passing H 2 S in acidic medium
  3. COnly M n 2 + shows the formation of precipitate by passing H 2 S in faintly basic medium
  4. DC u 2 + / C u has higher reduction potential than M n 2 + / M n (measured under similar conditions)

Correct answer

B. Only C u 2 + shows the formation of precipitate by passing H 2 S in acidic medium

Step-by-step solution

( A ) C u + 2 a n d M n + 2 both gives green colour in flame test and cannot distinguished ( B ) C u + 2 belongs to group-II of cationic radical will gives ppt. of CuS in acidic medium ( C ) C u + 2 a n d M n + 2 both form ppt. in basic medium ( D ) C u + 2 / C u = + 0.34 v S R P M n + 2 / M n = - 0.1 . 18 v S R P

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