. Write the balanced chemical equation for the following and identify

the type of reaction in each case:

(a) Potassium bromide(aq) + Barium iodide(aq) → Potassium iodide(aq) + Barium bromide(s)

(b) Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g)

(c) Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g)

(d) Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloride(aq) + Hydrogen(g)


Best Answer


  • 2KBr(aq) + Bal2 (aq) → 2KI(aq) +BaBr2 (s)

 There is only exchanges of ions take place between the  reactants.This is an example of double displacement reaction.

  • ZnCO3(s) → ZnO(s) + CO2(g)

One reactant molecule is giving two different product molecules; it is an example of decomposition reaction.

  • H2(g) + C12(g) → 2HC1(g)

The two different reacting species are combining to form a single product.This is an example of combination reaction.

  • Mg(g) + 2HC1(aq) → MgC12(aq) + H2(g)

Mg is displacing the H atom  in HCl so this is an example of displacement reaction. 

Final Answer:-

( A) is a double displacement reaction.

( B) is a decomposition reaction.

( C) is a combination reaction.

(D)  is a single displacement reaction.


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