Question

(a) Silver articles get tarnished
when kept open for longer time.
Why?​

Answer 1

Explanation:

When silver is exposed to sulfur-containing gases in the air, it discolours and then darkens as it reacts with the gas to form a surface layer of tarnish. ... If a silver object is to be kept from tarnishing, it must be protected from sulfur-containing gases.

Answer 2

Silver articles get tarnished when kept in open for a longer time because if the formation if silver sulphide. Silver reacts with hydrogen sulphide (present in the air ) to form silver sulphide.