Question

when Ag is exposed to air it gets black coating of-
(i) AgNo3
(ii) Ag2S
(iii) Ag2O
(iv) Ag2Co3​

Answer 1

Answer:

Ag2s(ii)

Explanation:

this is basically the corroison process of silver.

Answer 2

Answer:

When Ag is exposed to air it gets a black coating of silver sulphide $Ag_{2} S$. Option (ii) is correct.

Explanation:

• The process of the formation of black coating on the surface of the silver is also known as the tarnishing of the silver.
• The hydrogen sulphide which is present in the air reacts with the silver.

When the silver is exposed to air then it turns black after some time due to the formation of a coating of silver sulphide $(Ag_{2} S)$.

The reaction involved is:

$4Ag + 2H_{2} S +O_{2}$ → $2Ag_{2} S + 2H_{2} O$

So, when Ag is exposed to air it gets a black coating of silver sulphide $Ag_{2} S$.

Option (ii) is correct.