Question

When a grey coloured object made of metal A is left exposed to moist air for
considerable time, it gets covered with a red-brown flaky coating by the process
called B, which eats up the whole object gradually. It is said that the presence of
C and D is necessary for this process to take place.

Answer 1

A) its iron(fe)
B) the process is called rusting
C) air is necessary for it
D) and also water...

Answer 2

Answer:

A = iron

B = rusting

C = Oxygen

D = Water

E = Zinc metal