Question

Match the following:

Column A Types of chemical reaction	Column B Chemical equations
(a) Combination reaction	(i) $CaC{O}_3\stackrel{A}{\to }CaO+C{O}_2$
(b) Decomposition reaction	(ii) $2H_{2}O\stackrel{Electricity}{\to }2H_2+O_2$
(c) Displacement reaction	(iii) $CaO+C{O}_2\to CaC{O}_3$
(d) Analysis reaction	(iv) $Fe\left(s\right)+CuS{O}_4(aq.)\to FeS{O}_4\left(aq\right)+Cu\left(s\right)$

• A. a(ii), b(i), c(iv), d(iii)
• B. a(i), b(ii), c(iii), d(iv)
• C. a(iii), b(i), c(iv), d(ii)
• D. a(iii), b(i), c(ii), d(iv)

Answer 1

The correct option is C a(iii), b(i), c(iv), d(ii)

(a) Combination reaction : $Cao+C{O}_2\to CaC{O}_3$, in this reaction calcium oxide is combines with carbon dioxide to form calcium carbonate.

(b) Decomposition reaction : $CaC{O}_3\to CaO+C{O}_2$, in this reaction calcium carbonate is decomposed to calcium oxide and carbon dioxide.

(c) Displacement reaction : $Fe\left(s\right)+CuS{O}_4(aq.)\to FeS{O}_4\left(aq\right)+Cu\left(s\right)$, in this reaction Fe displaces copper to form ferric sulphate.

(d) Analysis reaction : $2H_{2}O\to 2H_2+O_2$

Hence, the correct option is $C$