Question

Assertion (A) : In the reaction, Na$_2$SO$_4$ + BaCl$_2$ $\longrightarrow$ BaSO$_4$ + 2NaCl, sodium chloride is precipitated.
Reason (R) : When an aqueous solution is added to another aqueous solution, an insoluble substance is formed, which is called precipitate.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false.
• D. Assertion (A) is false, but Reason (R) is true.

Hint:

Precipitation reaction: Insoluble salt (BaSO$_4$) precipitates, not the soluble salt (NaCl).

Answer 1

The Correct Option is C

In this double displacement reaction, barium sulphate (BaSO$_4$) is the insoluble white precipitate formed, not sodium chloride. Sodium chloride remains soluble in water. Therefore, the Assertion is true about the reaction but it incorrectly says NaCl is the precipitate. The Reason is true in general — an insoluble substance formed in an aqueous reaction is called a precipitate — but it does not correctly explain the wrong Assertion. So, Assertion is true, Reason is false.