Question

The reaction ${\mathrm{Na}}_2{\mathrm{SO}}_4+{\mathrm{BaCl}}_2\to {\mathrm{BaSO}}_4+2\mathrm{NaCl}$ is an example of a/an:

• A. Precipitation reaction
• B. Double displacement reaction
• C. Endothermic reaction
• D. All of the above

Answer 1

The correct option is D

All of the above

Explanation for the correct option:

Double displacement reaction: A Double displacement reactions may be defined as the chemical reactions in which the two reactants exchange their ions to form two new products.

Precipitation reaction: A precipitation reaction is a chemical reaction in which two ionic compounds react to form an insoluble salt (precipitate) as a product, is called precipitation reaction.

Endothermic reaction: A reaction which the reactants absorbs heat energy from the surroundings to give products, i.e., absorption of heat is seen.

1. The reaction $\underset{(\mathrm{Sodium}\mathrm{sulphate})}{\underbrace{{\mathrm{Na}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)}}+\underset{(\mathrm{Barium}\mathrm{chloride})}{\underbrace{{\mathrm{BaCl}}_2\left(\mathrm{aq}\right)}}\to \underset{\underset{\left(\mathrm{White}\right)}{\underbrace{(\mathrm{Barium}\mathrm{sulphate})}}}{\underbrace{{\mathrm{BaSO}}_4\left(\mathrm{s}\right)\downarrow }}+\underset{(\mathrm{Sodium}\mathrm{chloride})}{\underbrace{2\mathrm{NaCl}\left(\mathrm{aq}\right)}}-\mathrm{heat}$ is an example of of Double displacement reaction, where Sodium sulphate $\left(N{a}_{2}S{O}_4\right)$ and Barium chloride $\left(BaC{l}_2\right)$ are exchanging their ions to form two new products as Barium sulphate $\left(BaS{O}_4\right)$ and Sodium chloride $\left(NaCl\right)$.
2. Usually, this reaction results in precipitate formation, and here Barium sulphate $\left(BaS{O}_4\right)$ forming is a white precipitate, hence this it is precipitation reaction also.
3. The above reaction is also an endothermic reaction because the white precipitate is formed is cool, which inferred to be an endothermic reaction.

Therefore, the given reaction $\underset{(\mathrm{Sodium}\mathrm{sulphate})}{\underbrace{{\mathrm{Na}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)}}+\underset{(\mathrm{Barium}\mathrm{chloride})}{\underbrace{{\mathrm{BaCl}}_2\left(\mathrm{aq}\right)}}\to \underset{\underset{\left(\mathrm{White}\right)}{\underbrace{(\mathrm{Barium}\mathrm{sulphate})}}}{\underbrace{{\mathrm{BaSO}}_4\left(\mathrm{s}\right)\downarrow }}+\underset{(\mathrm{Sodium}\mathrm{chloride})}{\underbrace{2\mathrm{NaCl}\left(\mathrm{aq}\right)}}-\mathrm{heat}$ is all three a double displacement, precipitation and a endothermic reaction.

Explanation for the incorrect options:

Option (A) is incorrect because the above reaction is not alone a precipitation reaction.

Option (B) is incorrect because the above reaction is not alone a double displacement reaction.

Option (C) is incorrect because the above reaction is not alone an Endothermic reaction.

Hence, Option (D) all the above, is the correct option.