Write the balanced chemical equation for the following and identify the type of reaction in each case:

(a) Potassium bromide(aq) + Barium iodide(aq) $\to$ Potassium iodide(aq) + Barium bromide(s)

(b) Zinc carbonate(s) $\to$ Zinc oxide(s) + Carbon dioxide(g)

(c) Hydrogen(g) + Chlorine(g) $\to$ Hydrogen chloride(g)

(d) Magnesium(s) + Hydrochloric acid(aq) $\to$ Magnesium chloride(aq) + Hydrogen(g)

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Solution

(a) Potassium bromide(aq) + Barium iodide(aq) $\to$ Potassium iodide(aq) + Barium bromide(s)

$2 K B r_{(a q)} + {B a I_{2}}_{(a q)} \to 2 K I_{(a q)} + {B a B r_{2}}_{(s)}$

In this reaction, both the reactants exchange ions to form two new products. Hence, it is a double displacement reaction

(b) Zinc carbonate(s) $\to$ Zinc oxide(s) + Carbon dioxide(g)

${Z n C O_{3}}_{(s)} \to Z n O_{(s)} + {C O_{2}}_{(g)}$

In this reaction, a single substance yields two different products. Hence, it is a decomposition reaction.

(c) Hydrogen(g) + Chlorine(g) $\to$ Hydrogen chloride(g)

${H_{2}}_{(g)} + {C l_{2}}_{(g)} \to 2 H C l_{(g)}$

In this reaction, two different reactants react with each other to form a single product. Hence, it is called a combination reaction.

(d) Magnesium(s) + Hydrochloric acid(aq) $\to$ Magnesium chloride(aq) + Hydrogen(g)

$M g_{(s)} + 2 H C l_{(a q)} \to {M g C l_{2}}_{(a q)} + {H_{2}}_{(g)}$

In this reaction, more reactive Mg is replacing less reactive H. Hence, it is displacement reaction.

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Similar questions

1) zinc carbonate= zinc oxide+ carbon dioxide

2) potassium bromide+ barium iodide = potassium iodide + barium bromide

Balance the equations

Write the balanced chemical equations for the following reactions.
(A) Calcium hydroxide + Carbon dioxide → Calcium carbonate + water
(B) Zinc + Silver nitrate → Zinc nitrate + Silver
(C) Aluminium + copper chloride → Aluminium chloride + Copper
(D) Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride.

Q. Write the balanced chemical reaction for the following and identify the type of reaction in each case.
(A)

M a g n e s i u m_{(a)} + I o d i n e_{(g)} \to M a g n e s i u m i o d i d e_{(s)}

(B)

Z i n c_{(s)} + H y d r o c h l o r i c a c i d_{(a q)} \to Z i n c c h l o r i d e_{(a q)} + H y d r o g e n_{(g)}

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