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Which of the following pairs of compounds would form a precipitate when their aqueous solutions...

Chemistry
WAEC 2021

Which of the following pairs of compounds would form a precipitate when their aqueous solutions are mixed?

  • A. NaCl and KNO\(_{3}\)
  • B. KCL and NaNO\(_{3}\)
  • C. K\(_{2}\)SO\(_{4}\) and BaCl\(_{2}\)
  • D. NH\(_{4}\)NO\(_{3}\) and CO\(_{3}\)
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Correct Answer: Option C
Explanation

when potassium sulfate is mixed with barium chloride a white precipitate of barium sulfate will be form. barium sulfate is slightly soluble in water, so it will precipitate out as a solid

BaCl2 + K2SO4 → BaSO4 + 2KCl 

note; all substances are aqueous except BaSO4 which is solid

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