What information does the following chemical equations convey ?

(a) $Z n$ + $H_{2} S O_{4}$ $\to$ $Z n S O_{4}$ + $H_{2}$

(b) $M g$ + $2 H C l$ $\to$ $M g C l_{2}$ + $H_{2}$

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Solution

(a) The first equation conveys that Zinc metal reacts with Sulphuric acid to give rise to Zinc Sulphate and Hydrogen gas. In this reaction, zinc being a more reactive metal displaces Hydrogen from its sulphate solution. So this a displacement reaction.

(b) The second equation conveys that Magnesium reacts with hydrochloric acid to form Magnesium Chloride and Hydrogen gas. Magnesium displaces Hydrogen from its solution, thus it is a displacement reaction.

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Z n + H_{2} S O_{4} \to Z n S O_{4} + H_{2}

1.	Column-A Types of chemical reaction		Column-B Chemical equation
(A)	Combination reaction	(i)	$Z n + H_{2} S O_{4} \to Z n S O_{4} + H_{2}$
(B)	Oxidation & reduction reaction	(ii)	$2 H_{2} O E l e c t r i c i t y ⟶ 2 H_{2} + O_{2}$
(C)	Decomposition reaction	(iii)	$C a O + C O_{2} \to C a C O_{3}$
(D)	Displacement reaction	(iv)	$H_{2} + C l_{2} \to 2 H C l$
(E)	Double Displacement reaction	(v)	$B a C l_{2} + N a_{2} S O_{4} \to B a S O_{4} ↓ + N a C l$