Question

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

• A. Decomposition reaction
• B. Double displacement reaction
• C. Combination reaction
• D. Precipitation reaction

Answer 1

Answer: (B), (D)

Precipitation reaction

When barium chloride $\left({\text{BaCl}}_2\right)$ reacts with ammonium sulphate $\left[{\text{(NH}}_4{)}_2{\text{SO}}_4\right]$, it forms white precipitate of barium sulphate $\left({\text{BaSO}}_4\right)$ along with ammonium chloride$\left({\text{NH}}_4\text{Cl}\right)$. There is an exchange of ions which results in the formation of product. So, the given reaction is a precipitation as well as a double displacement reaction. The reaction involved is:

${\text{BaCl}}_2\text{(aq)}+{\text{(NH}}_4{)}_2{\text{SO}}_4\text{(aq)}\to {\text{BaSO}}_4\text{(s)}\downarrow +2{\text{NH}}_4\text{Cl}\text{(aq)}$