devarshi-dt-logo

Question:

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

Only Cu2+ shows the formation of precipitate by passing H2S in acidic medium.

Only Mn2+ shows the formation of precipitate by passing H2S in faintly basic medium.

Mn2+ shows the characteristic green colour in the flame test.

Cu2+/Cu has higher reduction potential than Mn2+/Mn (measured under similar conditions).

Solution:

(A) Cu2+ and Mn2+ both give green colour in a flame test, thus cannot be distinguished.