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

hey here is the answer

(2) double displacement

the above reaction is a precipitation reaction(type of double displacement reaction) in which an insoluble precipitate of barium sulphate is formed

Answer 2

When a student added a few drops of barium chloride solution to sodium sulphate solution, he obtained a white precipitate instantly, double displacement has been carried out by the student.

Explanation:

When the barium chloride interacts with sodium sulphate a white precipitate of barium sulphate (Inorganic compound containing the chemical formula $BaSO_4$ is barium sulphate. It is an odorless white crystalline solid) is found along with the sodium chloride (NaCl) .

The example of dual displacement is.

$BaCl_2+Na_2 SO_4 -> 2NaCl+BaSO_4$

Therefore the correct answer is Option (2) double displacement