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

(a)3Fe + 2O2 Fe3O4

BBaCl2 + K2CO3 BaCO3 + 2KCl
CNiCO3 NiO + CO2
DCl2 + 2NaBr 2NaCl + Br2

Verified Answer :

InverseOperator
Bis an example of a Double Displacement Reaction:

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

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.

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