Question

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

The correct option is D

The explanation for the correct option:

1. When two reactants exchange ions to create two new compounds, the reaction is known as a double displacement reaction.
2. Precipitate formation often results in a double displacement reaction.
3. A type of double displacement reaction called a precipitation reaction happens when two aqueous ionic compounds interact to create a new, insoluble ionic molecule.
4. Ammonium sulfate and barium chloride react to form Ammonium chloride and barium sulfate.$\underset{\mathrm{Ammonium}\mathrm{sulfate}}{{\left({\mathrm{NH}}_4\right)}_2{\mathrm{SO}}_4\left(\mathrm{s}\right)}+\underset{\mathrm{Barium}\mathrm{chloride}}{{\mathrm{BaCl}}_2\left(\mathrm{aq}\right)}\to \underset{\mathrm{Barium}\mathrm{sulfate}\left(\mathrm{ppt}\right)}{{\mathrm{BaSO}}_4\left(\mathrm{s}\right)}+\underset{\mathrm{Ammonium}\mathrm{chloride}}{2{\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{aq}\right)}$
5. Since ammonium and barium are being displaced from their respective salts, the reaction is an example of a double displacement reaction.
6. Also, it is a precipitation reaction as the white precipitate of barium sulfate is formed.

The explanation for the incorrect options:

Option A: (i) only

1. The given reaction of Ammonium sulfate and barium chloride reacts to form Ammonium sulfate and barium sulfate is a double displacement reaction as two ions are being displaced from their salts.
2. Hence, it is an incorrect option.

Option B: (ii) only

1. Along with precipitation it is a double displacement reaction as two new compounds are formed by displacing two ions from their respective salts.
2. Hence, it is an incorrect option.

Option C: (iv) only

1. In a combination reaction two or more reactants are combined to form one product.
2. But in the given reaction, two new products are formed due to the displacement of ions.
3. Hence, it is an incorrect option.

Final answer: Therefore, Barium chloride on reacting with ammonium sulfate forms barium sulfate and ammonium chloride is the double displacement and precipitation reaction.