Question

Which of these reactions can be classified as double replacement reactions?

A) Zn + 2HCl → ZnCl2 + H2

B) 2NaCl + F2 → 2NaF + Cl2

C) 2AlBr3 + 3K2SO4 → 6KBr + Al2(SO4)3

D) 2K + MgBr2 → 2KBr + Mg

Answer 1

The correct answer is option C.

Step-by-step explanation:

Double displacement reaction is defined as the reaction in which exchange of ions takes place to give a product.

`AB+CD\rightarrow CB+AD`

Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element from its chemical reaction.

`AB+C\rightarrow CB+A`

From all the given options the reaction which is classified as Double displacement reaction is :

`2AlBr_3 + 3K_2SO_4\rightarrow 6KBr + Al_2(SO_4)_3`

Where as other reactions are the examples of Single displacement reaction.

Answer 2

C is the answer. Reasons being that, two elements from both side of the reactant switches side to form two new compounds. On the other hand, A , B and D involves one element displacing the other to produce a new compound.