Question

$AB+CD\to AD+CB$.

The above given reaction is an example of ____________.

• A. Single replacement
• B. Double replacement
• C. Acid-base reaction
• D. Synthesis reaction

Answer 1

Answer: (B)

Double replacement

In a double replacement reaction, the anions and cations of two compounds switch places and form two entirely different compounds. $\left[18\right]$ These reactions are in the general form:

$AB+CD\to AD+CB$

For example, when barium chloride $\left(BaC{l}_2\right)$ and magnesium sulfate $\left(MgS{O}_4\right)$ react, the $S{O}_4{2}^{}$ anion switches places with the $2C{l}^{}$ anion, giving the compounds $BaS{O}_4$ and $MgC{l}_2$.

Hence, the correct option is $\text{B}$