Question

Barium chloride on reaction with ammonium sulphate from Barium sulphate and ammonium chloride. The reaction is an example of
(A) Double displacement reaction.
(B) Displacement reaction and precipitation reaction
(C) combination reaction and precipitation reaction
(D) Double displacement reaction and precipitation reaction

Answer 1

Hint: In order to understand what type of reaction will take place when Barium chloride reacts with ammonium sulphate, we must know what will happen when both the reactants combine with each other. We can see that one component of each component will be exchanged between each other.

Complete Solution :
In order to answer the given question, we must first know what a displacement reaction is. Displacement reaction is a reaction in which an atom or ion present in a compound is replaced by another atom or ion present in another compound. Displacement reaction can be either single displacement reaction or double displacement reaction. Now let us move onto the problem given. When a barium chloride reacts with ammonium sulphate it will form Barium sulphate and ammonium chloride. This is an example of double displacement reaction and precipitation reaction. This is called double displacement because one component of each compound will be exchanged between one another. This is called precipitation reaction because white precipitate of Barium sulphate will be formed. The remaining compounds present will be soluble in water, but the barium sulphate will not be soluble because it forms white precipitate. The double displacement reaction is given below:
\[BaC{l_2} + {(N{H_4})_2}S{O_4} \to BaS{O_4} \downarrow + 2N{H_4}Cl\]

So, the correct answer is “Option D”.

Note: Double displacement reaction is not redox reaction but the displacement reaction is a redox reaction. Double displacement reaction is not redox because there is no change in the oxidation state of the compounds.