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Q.

The correct option(s) to distinguish nitrate salts of Mn2+ and Cu2+ taken separately is (are):-

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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)

answer is B.

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Detailed Solution

A)  Cu2+ and Mn2+ both gives green colour in flame test and cannot distinguished.B)   Cu2+ belongs to group-II of cationic radical will gives ppt. of CuS in acidic medium.C)   Cu2+ and Mn2+ both form ppt. in basic medium.D)  Cu2+/Cu = +0.34 V (SRP)Mn2+/Mn = – 1.18 V (SRP)
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