Write the equations for the following reaction.
Zinc with hydrochloric acid.

Write the equation for the following reaction:

Magnesium with aluminium sulphate.

Solve the crossword given below.

 
Across
2. Coating of iron or steel surface with a layer of zinc to prevent rusting.
3. Extraction of metals from its ores present in the earth's crust.
4. Substances which do not allow heat to pass through them.
6. The property that allows materials to be drawn into wires.
Down
1. The property of a material to be beaten into sheets.
5. The ability to produce sound on being struck.

Give the reason for the following:

Sodium is stored under kerosene.

Give reason for the following:

Iron cannot displace zinc from its solution.

Give reason for the following:

A copper vessel acquires a dull green coating if exposed to moist air for long.