Question

pls help me very fast...pls​

Answer 1

Answer:

Note: Rust formation requires both air and moisture.

1. Layer of oil prevents the entry of air....hence nail does not rust due to absence of air
2. In tt 4 , though air is present but anhydrous calcium chloride absorbs all the moisture....hence it wont rust
3. In tt 2 both moisture and air are easily available whereas in tt 3 nail needs to receieve moisture present in surrounding air....