Question

Please help , match the following:
Match the statements in Column A with those in Column B.
Column A
1. Coating iron sheets with zinc to prevent rusting,
2. A material obtained on melting iron with nickel and chromium.
3. A change in which new substances are formed.
4. A faloy brown material formed on the surface of iron.
5. A process of obtaining pure crystals from impure crystals.
the following as physical and chemical changes.
Column B
(a) Chemical change
(b) Galvanisation
(c) Rust
(d) Crystallisation
(c) Stainless steel​

Answer 1

Answer:

1-b

2-stainless steel

3-a

4-c

5-crystallisation

Answer 2

Answer:

in your last question

answer is

option a.

o2 is needed and co2 is not needed