Question

Barium chloride on reacting with ammonium sulfate forms barium sulfate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

(i) Displacement reaction

(ii) Precipitation reaction

(iii) Combination reaction

(Iv) Double displacement reaction

• A. (i) only
• B. (ii) only
• C. (iv) only
• D. (ii) and (iv)

Answer 1

The correct option is D

(ii) and (iv)

Explanation:

• In a double displacement reaction, two reactant compounds reacts by an exchange of ions to form the two new compounds.
• The reaction in which a solid (insoluble solid) product is formed from the soluble or aqueous reactant molecules is termed as a precipitation reaction.
• The reaction between the aqueous solutions of Barium chloride $\left(BaC{l}_2\right)$and Ammonium sulfate $\left({\left(N{H}_4\right)}_{2}S{O}_4\right)$ leads to the formation of solid Barium sulfate $\left(BaS{O}_4\right)$and soluble Ammonium chloride $\left(N{H}_{4}Cl\right)$. The chemical equation for the reaction between Barium chloride and Ammonium sulfate is:

${\mathrm{BaCl}}_2\left(\mathrm{aq}\right)+{\left({\mathrm{NH}}_4\right)}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)\to {\mathrm{BaSO}}_4\left(\mathrm{s}\right)+2{\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{aq}\right)$

• Since both the reactants react by an exchange of their ions, also, the formation of an insoluble solid (precipitate) named barium sulphate takes place thus, the given reaction is classified as a double displacement reaction along with a precipitation reaction.

Final Answer:

Therefore, the correct option is D.