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GK QUESTION#3362

Assertion (A): When aqueous solutions of sodium sulphate and barium chloride are mixed, a white precipitate is formed.

Reason (R): Barium sulphate is insoluble in water and hence precipitates out.

  1. ABoth A and R are true, and R is the correct explanation of ACorrect answer
  2. BBoth A and R are true, but R is not the correct explanation of A
  3. CA is true, but R is false
  4. DA is false, but R is true
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Answer

A. Both A and R are true, and R is the correct explanation of A

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Explanation

Mixing sodium sulphate and barium chloride solutions forms white barium sulphate: Na₂SO₄+BaCl₂→BaSO₄(s)+2NaCl. The net ionic process is Ba²⁺+SO₄²⁻→BaSO₄(s). Its very low solubility explains why it precipitates, so both the assertion and reason are true and the reason explains the assertion.

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