Sulphur dioxide reacts with sodium hydroxide solution to form _____

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 

The reaction of the iron nail with copper sulphate solution is a _____ reaction. 

Which of the following are combination reaction?

(i) $2{\mathrm{KClO}}_3\stackrel{∆}{\to }2\mathrm{KCl}+3{\mathrm{O}}_2$

(ii) $\mathrm{MgO}+{\mathrm{H}}_2\mathrm{O}\to \mathrm{Mg}{\left(\mathrm{OH}\right)}_2$

(iii) $4\mathrm{Al}+3{\mathrm{O}}_2\to 2{\mathrm{Al}}_2{\mathrm{O}}_3$

(iv) $\mathrm{Zn} + {\mathrm{FeSO}}_4\to {\mathrm{ZnSO}}_4 + \mathrm{Fe}$

Match the items of the column -I with column-II and choose the correct option.

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 :

Write a balanced chemical equation for the following:

• Reaction of lead nitrate solution with ammonium hydroxide.

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:- 

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?