Question

Which of the following is an example of a double replacement reaction?

Answer 1

B) is an example of a Double Displacement Reaction:

Ba  Cl2 + K2 CO3  ---> Ba  CO3 + 2K   Cl 
A    B       C   D             A    D           B   C

Answer 2

Answer: The correct answer is Option b.

Explanation:

Double displacement reactions are defined as the reactions in which exchange of ions takes place.

$AB+CD\rightarrow CB+AD$

For the given options:

Option a: $3Fe+2O_2\rightarrow Fe_3O_4$

This is an example of synthesis reaction.

Option b: $BaCl_2+K_2CO_3\rightarrow BaCO_3+2KCl$

This is an example of double displacement reaction.

Option c: $NiCO_3\rightarrow NiO+CO_2$

This is an example of decomposition reaction.

Option d: $Cl_2+2NaBr\rightarrow 2NaCl+Br_2$

This is an example of single displacement reaction.

From the above information, the correct answer is Option b.