What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride? State the physical conditions of reactants in which the reaction between them will not take place. Write the balanced chemical equation for the reaction and name the type of reaction.  

Solid calcium oxide was taken in a container and water was added slowly to it.

State two observations made in the experiment.

Solid calcium oxide was taken in a container and water was added slowly to it.

Write the name and the chemical formula of the product.

Name the substance oxidised and the substance reduced, and also identify the oxidising agent and reducing agent in the following reactions:

$3{\mathrm{MnO}}_2 + 4\mathrm{Al} \to 3\mathrm{Mn} + 2{\mathrm{Al}}_2{\mathrm{O}}_3$

Name the substance oxidised and the substance reduced, and also identify the oxidising agent and reducing agent in the following reaction:

${\mathrm{Fe}}_2{\mathrm{O}}_3+\mathrm{CO}\to 2\mathrm{Fe}+3{\mathrm{CO}}_2$

Name the substance oxidised and the substance reduced, and also identify the oxidising agent and reducing agent in the following reaction:

${\mathrm{SO}}_2 + 2{\mathrm{H}}_2\mathrm{S} \to 3\mathrm{S} +2{\mathrm{H}}_2\mathrm{O}$

Name the reducing agent in the following reaction:

$3{\mathrm{MnO}}_2+4\mathrm{Al}\to 3\mathrm{Mn}+2{\mathrm{Al}}_2{\mathrm{O}}_3$

State which is more reactive, Mn or Al and why?

When a metal X is treated with a dilute acid Y, then a gas Z is evolved which burns readily by making a little explosion.

(a) Name any two metals which can behave like metal X.

(b) Name any two acids which can behave like acid Y.

(c) Name gas Z.

(d) Is the reaction between metal X and dilute acid Y exothermic or endothermic.