JEE Advanced | 2018Analytical ChemistryEasy
Question
The correct option(s) to distinguish nitrate salts of Mn2+ and Cu2+ taken separately is (are) :-
Options
A.
Mn2+ shows the characteristic green colour in the flame test
B.
Only Cu2+ shows the formation of precipitate by passing H2S in acidic medium
C.
Only Mn2+ shows the formation of precipitate by passing H2S in faintly basic medium
D.
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 = +0.34 V (SRP)
Mn+2/Mn = – 1.18 V (SRP)
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