Question

1.	Column-A Types of chemical reaction		Column-B Chemical equation
(A)	Combination reaction	(i)	$Zn+H_{2}S{O}_4\to ZnS{O}_4+H_2$
(B)	Oxidation & reduction reaction	(ii)	$2H_{2}O\stackrel{Electricity}{⟶}2H_2+O_2$
(C)	Decomposition reaction	(iii)	$CaO+C{O}_2\to CaC{O}_3$
(D)	Displacement reaction	(iv)	$H_2+C{l}_2\to 2HCl$
(E)	Double Displacement reaction	(v)	$BaC{l}_2+N{a}_{2}S{O}_4\to BaS{O}_4\downarrow +NaCl$

• A. (A) $\to$ (ii),(iv); (B) $\to$ (iii),(iv); (C) $\to$ (ii); (D) $\to$ (ii); (E) $\to$(iv).
• B. (A) $\to$ (iii),(v); (B) $\to$ (iii),(iv); (C) $\to$ (ii); (D) $\to$ (i); (E) $\to$(iv).
• C. (A) $\to$ (ii),(iv); (B) $\to$ (ii),(i); (C) $\to$ (iii); (D) $\to$ (ii); (E) $\to$(iv).
• D. (A) $\to$ (iii),(iv); (B) $\to$ (ii),(iv); (C) $\to$ (ii); (D) $\to$ (i); (E) $\to$(v).

Answer 1

The correct option is D (A) $\to$ (iii),(iv); (B) $\to$ (ii),(iv); (C) $\to$ (ii); (D) $\to$ (i); (E) $\to$(v).

Double displacement reactions may be defined as the chemical reactions in which one component each of both the reacting molecules is exchanged to form the products. During this reaction, the cations and anions of two different compounds switch places, forming two entirely different compounds.

$BaC{l}_2+N{a}_{2}S{O}_4\to BaS{O}_4\downarrow +NaCl$

Decomposition reaction - separation of a substance into two or more substances that may differ from each other and from the original substance.

$2H_{2}O\stackrel{Electricity}{⟶}2H_2+O_2$

A combination reaction is a reaction where two or more elements or compounds (reactants) combine together to form a single compound (product).

$H_2+C{l}_2\to 2HCl$

$CaO+C{O}_2\to CaC{O}_3$

A displacement reaction is a type of reaction where part of one reactant is replaced by another reactant.

$Zn+H_{2}S{O}_4\to ZnS{O}_4+H_2$

• Oxidation is gain of oxygen.

• Oxidation is loss of hydrogen

• Reduction is loss of oxygen

• Reduction is gain of oxygen