Question

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
(a) Do you think rust is different from iron?
(b) Can you change rust back into iron by some simple method?
(c) Do you think formation of rust on iron is a chemical change?
(d) Give two other examples of a similar type of change. [NCERT Exemplar]

Answer 1

Answer:

A) Yes Rust is totally different from iron.Iron is a metal ehich is strong but rust is a flaky substance.

B)No

C) Yes

D)

• Black coating on silver substance.
• Green coating layer on copper substance.

Answer 2

1. Rust is not different from iron because it is the simple part of iron which has whether due to presence of moisture
2. No it cannot be converted because rusting is a chemical process
3. yes formation of rust is a chemical change
4. corrosion, tarnish