Air, combustion, rusting and fire fighting questions | form one Chemistry

1. i)State two conditions required for iron to rust

          ii)List two methods which are used to prevent rusting of iron.

2. State three properties that make aluminium useful in overhead cables.

Answer / Solution

UNSOLVED

Why oxygen as one of the components of air is unique?
A It support combustion
B It is a diatomic gas.
C It forms the largest part of the air.
D It has the largest density.

Answer / Solution

UNSOLVED

Which conditions are necessary for iron nails to rust?
A oxygen and moisture
B carbon and oxygen
C carbon dioxide and oxygen
D oxygen and nitrogen.

Answer / Solution

UNSOLVED

Giving a reason, state whether rust will form or not in each of the situations (i) - (vi).

1. Iron bar is dipped into boiling water.
2. Painted iron is dipped into un-boiled water.
3. Iron bar is dipped in un-boiled water.
4. Oiled bar is left outside the room over nights.
5. Aluminium wire is dipped in un-boiled water.
6. A dry iron bar is wrapped with cotton wool.

Answer / Solution

UNSOLVED

Briefly explain any four methods of preventing rusting.

Answer / Solution

UNSOLVED