State one observation for each of the following;
Zinc nitrate crystals are strongly heated
Reddish brown fumes of nitrogen dioxide a colourless gas that rekindles a glowing splint are released . In the test tube , a ppt is left which is yellow when hot and white when cold.
The following questions are relevant to the extraction of Aluminium.
i) State the reason for the addition of caustic alkali to bauxite or during purification of bauxite.
(ii) give a balanced chemical equation for the above reaction.
(iii) Along with cryolite and alumina, another substance is added to the electrolyte mixture. Name the substance and give one reason for the addition.
State one observation for each of the following;
A zinc granule is added to copper sulphate solution.
State one observation for each of the following:
Sodium hydroxide solution is added to ferric chloride solution at first a little and then in excess.
Give reason for the following:
An aqueous solution of sodium chloride conducts electricity.
State one chemical test between each of the following pairs:
Ferrous nitrate and lead nitrate.
Give balanced equation for the following reaction:
Dilute nitric acids and copper carbonate.
State one observation for each of the following:
Excess ammonium hydroxide solution is added to lead nitrate solution.
Draw an electron dot diagram to show the structure of hydronium ion. State the type of bonding present in it.
