Question

When a student added a few drops of barium chloride solution to sodium sulphate solution, he obtained a white precipitate instantly. Which of the following type of chemical reaction has been carried out by the student ?
(1) combination
(2) double displacement
(3) displacement
(4) decomposition

Answer 1

Answer:

the above reaction is double displacement reaction because exchange of ions had been taken place

Answer 2

Answer is Option (b)

Explanation:

• A white precipitate is formed due to the formation of barium sulphate while sodium chloride remains in the solution. The reaction is:

Barium chloride + Sodium sulphate → Barium sulphate(s) + Sodium chloride(aq)

Or

$BaCl_2$ + $Na_2SO_4$---> $BaSO_4$ + 2NaCl

• Which can be referred to as a Double Displacment reaction.

Where in $SO_4^2^-$ replaces Chlorine ion ($Cl^-$) and making Sodium to bond with Chlorine.