State one appropriate observation for the following:
Zinc nitrate crystals are strongly heated.

State one observation for the following: Zinc nitrate crystals are strongly heated.

When zinc nitrate crystals are strongly heated it gives:

State one appropriate observation for the following: Concentrated sulphuric acid is added drop wise to a crystal of hydrated copper sulphate.

State one observation for the following: Lead nitrate is heated strongly in a test tube.

State two relevant observations for each of the following: Lead nitrate crystals are heated in a hard glass test tube.

State one appropriate observation for the following: When dilute hydrochloric acid is added to calcium carbonate crystals.

State relevant observations for the following: Lead nitrate crystals are heated in á hard glass test tube.

State one appropriate observation for the following: When dilute hydrochloric acid is added to sodium carbonate crystals.

State one appropriate observation for the following: Dilute hydrochloric acid is added to copper carbonate.

State one appropriate observation for each of the following: Electricity is passed through molten lead bromide.