Question

Classify the following reactions-

(i) ${\mathrm{N}}_2+{\mathrm{O}}_2\to 2\mathrm{NO}-\mathrm{Heat}$

(ii) $2\mathrm{HgO}\to 2\mathrm{Hg}+{\mathrm{O}}_2$

(iii) ${\mathrm{Na}}_2{\mathrm{SO}}_4+{\mathrm{BaCl}}_2\to 2\mathrm{NaCl}+{\mathrm{BaSO}}_4$

(iv) ${\mathrm{CuSO}}_4\left(\mathrm{aq}\right)+\mathrm{Zn}\to {\mathrm{ZnSO}}_4\left(\mathrm{aq}\right)+\mathrm{Cu}$

(v) ${\mathrm{NH}}_3+\mathrm{HCl}\to {\mathrm{NH}}_4\mathrm{Cl}$

Answer 1

Types of chemical reactions:

There are five types of chemical reactions:

(i) Combination reactions: When two reactants combine to give a single product then the reaction is known as combination reactions.

(ii) Displacement reactions: When the metal having higher reactivity displaces other metals, then the reaction is called displacement reaction.

(iii) Double displacement reactions: In such reactions, the reactants interchange their ions and form new substances.

(iv) Decomposition reactions: When a single reactant gets decomposed into two or more products, this type of reaction is called decomposition reaction.

(v) Oxidation-reduction reactions: The reaction in which oxygen is added and hydrogen is removed is called an oxidation reaction. On the other hand, when hydrogen is added and oxygen is removed is called a reduction reaction.

(i) ${\mathrm{N}}_2+{\mathrm{O}}_2\to 2\mathrm{NO}-\mathrm{Heat}$

In this reaction, two elements join to form a single product. Hence, the reaction is a combination reaction.

(ii) $2\mathrm{HgO}\to 2\mathrm{Hg}+{\mathrm{O}}_2$

The reaction is a decomposition reaction as Mercury oxide (HgO) is breaking down into two products.

(iii) ${\mathrm{Na}}_2{\mathrm{SO}}_4+{\mathrm{BaCl}}_2\to 2\mathrm{NaCl}+{\mathrm{BaSO}}_4$

In the given reaction, Sulfate ions $\left({\mathrm{SO}}_4^{2-}\right)$ and Chloride $\left({\mathrm{Cl}}^{-}\right)$ ions are get replaced by each other. Therefore, the reaction is a double displacement reaction.

(iv) ${\mathrm{CuSO}}_4\left(\mathrm{aq}\right)+\mathrm{Zn}\to {\mathrm{ZnSO}}_4\left(\mathrm{aq}\right)+\mathrm{Cu}$

The type of reaction is displacement reaction because Zinc (Zn) being more reactive displaces Copper (Cu).

(v) ${\mathrm{NH}}_3+\mathrm{HCl}\to {\mathrm{NH}}_4\mathrm{Cl}$

In this reaction, a single product is formed after combining two reactants. therefore, the reaction is a combination reaction.