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Chemistry CBSE Live product
Class 7 (2026-27)
The World of Metals and Non-metals
Term I Revision II - The world of metals and non-metals
1.
Effect of Air and Water on Metals – Iron
Question:
1
m.
Go through
each observation carefully and
find
the most
right
inference.
Observation:
An iron nail completely immersed in boiled water and covered with a layer of oil did not rust.
Inference:
Oil reacts with iron to form rust
Air was prevented from reaching the nail
Iron cannot rust in water
Rusting does not require air
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