Question

On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained. What other name can be given to this precipitation reaction?

• A. Synthesis reaction
• B. Double displacement reaction
• C. Combination reaction
• D. Decomposition reaction

Answer 1

The correct option is B Double displacement reaction

Barium chloride ($BaC{l}_2$) reacts with sodium sulphite ($N{a}_{2}S{O}_3$) to form barium sulphite ($BaS{O}_3$) and sodium chloride (NaCl).

$BaC{l}_2\left(aq\right)+N{a}_{2}S{O}_3\left(aq\right)\to BaS{O}_3\left(s\right)+2NaCl\left(aq\right)$
(white ppt)

The above precipitation reaction is also a double displacement reaction as both reactants exchange their ions to form new products.