Question

On adding a drop of barium chloride solution to an aqueous solution of sodium sulfite, a white precipitate is obtained. What other name can be given to this precipitation reaction?
A.Synthesis reaction
B.Double displacement reaction
C.Displacement reaction
D.Exothermic reaction

Answer 1

In chemistry, during the reaction some reactants take part then it changes into another form of substance as a product. These chemical reaction categories according to their reactant and product behavior.

Complete step by step answer:
There are several types of chemical reactions in chemistry.
Let's discuss a few here.
1. Combustion reaction - When a reactant reacts in the presence of oxygen and produces a product in the form of light and heat is known as a combustion reaction.
Example - $$$$ $S + {O_2} \to S{O_2}$
2. Decomposition reaction - When one reactant breaks into two or more products is known as a decomposition reaction.
Example - $CaC{O_3} \to CaO + C{O_2}$
3. Synthesis - When two simple reactants combine and form a new one complex is known as Synthesis reaction.
Example - $8Fe + {S_8} \to 8FeS$
4. Displacement - When single reactant displaces the other combined reactant during reaction.
Example - $P + QR \to PR + Q$
5. Double displacement - When both combined reactants change their place each other is known as double displacement. It is also known as a precipitation reaction.
Example - $PQ + RS \to PR + QS$
According to the question, we have
$BaC{l_2} + N{a_2}S{O_3} \to BaS{O_3} + 2NaCl$
Here, in this reaction, we can see that $Ba$ attach with $S{O_3}$ and $Na$ attach with $Cl$. Hence, both reactants exchange their places. Therefore, it is a double displacement reaction and is also known as a precipitation reaction.
So, option B is the correct answer here.

Note: In a chemical reaction, the reactant is on the left side and the product is on right. After the reaction, it needs to be balanced by equal the number of atoms on both sides. Precipitation - It is a solid substance in the solution that produces during the chemical reaction. In the above reaction $BaS{O_3}$ is white precipitation.