The Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during the electrolysis of water is

Calcium oxide reacts vigorously with water to produce slaked lime.

${\mathrm{CaO}}_{\left(\mathrm{s}\right)}+{\mathrm{H}}_2{\mathrm{O}}_{\left(\mathrm{l}\right)} \to \mathrm{Ca}{\left(\mathrm{OH}\right)}_{2\left(\mathrm{aq}\right)}$

This reaction can be classified as:

(A) Combination reaction        (B) Exothermic reaction

(C) Endothermic reaction        (D) Oxidation reaction

Which of the following is the correct answer?

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of a :

Identify the correct oxidant and reductant in the following reaction

$\mathrm{PbS}+4{\mathrm{H}}_2{\mathrm{O}}_2 \stackrel{}{\to }{\mathrm{PbSO}}_4+4{\mathrm{H}}_2\mathrm{O}$

In a double displacement reaction such as the reaction between sodium sulphate solution and barium chloride solution:

(A) exchange of atoms takes place.

(B) exchange of ions takes place.

(C) a precipitate is produced.

(D) an insoluble salt is produced.

The correct option is:

${\mathrm{CH}}_4+{\mathrm{Cl}}_2 \stackrel{\mathrm{sunlight}}{\to } {\mathrm{CH}}_3\mathrm{Cl} + \mathrm{HCl}$

This reaction is 

State one observation for the following:

Copper sulphate solution is electrolysed using copper electrodes.

Name the gas that is produced in the following case:

At the anode during the electrolysis of acidified water.

Consider the following equation of the chemical reaction of a metal M

$4\mathrm{M}+3{\mathrm{O}}_2 \stackrel{}{\to } {\mathrm{M}}_2{\mathrm{O}}_3$

The equation represents:- 

State one relevant reason for the following:

• Graphite anode is preferred to platinum in the electrolysis of molten lead bromide.

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

The above reaction is an example of a 

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

The above reaction is an example of a

In the equation $\mathrm{CuO}+{\mathrm{H}}_2\to \mathrm{Cu}+{\mathrm{H}}_2\mathrm{O}$, the substance reduced is 

State one relevant observation for of the following:

At the anode, when molten lead bromide is electrolyzed using graphite electrodes.