Question

(1)
M
'
"
"
)
(a)
Silver articles generally turn black when kept in the open for a few
days. The articles when rubbed with tooth-paste again start
shining.
(i) Why do silver articles turn black when kept in the open for a
few days ? Name the phenomenon involved.
(ii) Name the black substance formed and give its chemical
formula.

Answer 1

Answer:

due to exposure to air and moisture it changes it's colour

Answer 2

Answer:due to exposure to air

Explanation:

Silver article tend to react with the oxygen present in the atmosphere and form silver oxide(AgO)

When silver oxide is rubbed with the toothpaste it washes away after reacting thus obtaining silver(Ag) in its pure state

2Ag+O2 → 2AgO

The black substance so formed is Silver oxide (AgO)

Plssss.....mark this as a brain list answer!!