Question 10 - MCQs from NCERT Exemplar - Chapter 1 Class 10 - Chemical Reactions and Equations

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?

(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

Let’s look at all the reactions

• Displacement Reaction : Reaction in which more reactive element takes the place of less reactive element.
• Precipitation Reaction: Reaction in which an insoluble substance called precipitate is formed.

• Combination Reaction : When two or more substances react to form a single product , it is known as combination reaction.
• Double displacement reaction : The two reacting species exchange their positive and negative ions .

The reaction of barium chloride with ammonium sulphate is given below: 

Here,

• This is a double displacement reaction because the reacting species are exchanging their cations. 
• Also, since a white colored colored precipitate of BaSO ₄ is being formed, this is a precipitation reaction.

So, the correct option is (d) - (ii) and (iv)