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

The correct option(s) to distinguish nitrate salts of Mn2+ and Cu2+ taken separately is(are)
  1. Mn2+ shows the characteristic green colour in the flame test
  2. Only Cu2+ shows the formation of precipitate by passing H2S in acidic medium
  3. Only Mn2+ shows the formation of precipitate by passing H2S in faintly basic medium
  4. Cu2+/Cu has higher reduction potential than Mn2+/Mn (measured under similar conditions)

Solution

(A) Cu+2 and Mn+2 both gives green colour in flame test and cannot distinguished
(B) Cu+2 belongs to group-II of cationic radical will gives ppt. of CuS in acidic medium
(C) Cu+2 and Mn+2 both form ppt. in basic medium
(D) Cu+2/Cu=+0.34v SRP
Mn+2/Mn=-0.1.18v SRP !

Asked in: JEE Advanced 2018 (Paper 2)

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