| Take 5 mL of sodium sulphate solution in a test tube and 5 mL of barium chloride solution in another test tube. When the two solutions are mixed slowly and the test tube is left undisturbed for some time, a white precipitate is formed. |
| Which of the following statements is correct about the above reaction? |
A) It is a double displacement reaction since exchange of ions occurs between the two reactants.
B) It is a combination reaction since barium ions combine with sulphate ions to give barium sulphate.
C) It is a displacement reaction since chloride ions are replaced by sulphate ions.
D) It is a neutralization reaction since an acid reacts with alkali to give a salt.
Correct Answer: A
Solution :
\[\underset{\begin{smallmatrix} Barium \\ chloride \end{smallmatrix}}{\mathop{BaC{{l}_{2(aq)}}}}\,+\underset{\begin{smallmatrix} Sodium \\ sulphate \end{smallmatrix}}{\mathop{N{{a}_{2}}S{{O}_{4}}}}\,\xrightarrow{{}}\underset{\begin{smallmatrix} Barium \\ sulphate \\ (White\,ppt.) \end{smallmatrix}}{\mathop{BaS{{O}_{4(s)}}}}\,+2NaCl\] It is a double displacement reaction as the exchange of ions occurs between the reactants. It is also called precipitation reaction as insoluble substance (i.e., precipitate) is formed in this reaction.
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