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

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Solution

When barium chloride is reacted with sodium sulphate then a white precipitate of barium sulphate and aqueous solution of sodium chloride salt is obtained.
${BaCl}_{2} (aq) + {Na}_{2} {SO}_{4} (aq) \to Ba ({SO}_{4})_{2} (aq) + NaCl (aq)$
So, the following reaction is an example of double displacement reaction.

Hence, the correct answer is option 2.

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When a solution of sodium sulphate is added to a solution of barium chloride, a white precipitate appears. The white precipitate is due to formation of:

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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

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