Name the following:
A compound added to lower the fusion temperature of electrolytic bath in the extraction of aluminium.

42.

Name the following:

The ore of zinc-containing its sulphide.

Write a balanced equation for the following:

The action of dilute hydrochloric acid on sodium sulphide.

State your observation in each of the following cases:

When dilute hydrochloric acid is added to sodium carbonate crystal

When moist starch iodide paper is introduced into chlorine gas.

Write balanced equation for the following:

The action of warm water on magnesium nitride.

State your observation in the following case:

When calcium hydroxide is heated with ammonium chloride crystal.

Name the other ion formed when ammonia dissolves in water.

Give one test that can be used to detect the presence of the ion produced

Write balanced equation for the following:

Action of heat on a mixture  of copper and concentrated nitric acid.