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Which of the following reactions is both a double displacement reaction and a precipitation reaction?

Answer and explanation

Correct answer: BaCl_2(aq) + Na_2SO_4(aq) → BaSO_4(s) + 2NaCl(aq)

In reaction A, Ba^{2+} and Na^+ exchange partners, so it is a double displacement reaction. Insoluble white BaSO_4 forms as a precipitate, so it is also a precipitation reaction. In contrast, option B is a combination/oxidation reaction of magnesium, not an exchange of ions.

Related tags

ScienceClass 10Chemical ReactionsDouble DisplacementPrecipitationBarium Sulphate

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