Displacement reaction — task. Chemistry CBSE Live product, Class 10.

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Which of the following indicates a displacement reaction?

\(CaO\) + \(CO_2\) → \(CaCO_3\)
\(CaCO_3\) → \(CaO\) + \(CO_2\)
\(Cu\) + \(2AgNO_3\) → \(CuNO_3\) + \(2Ag\)
\(CuSO_4\) + \(H_2S\) → \(CuS\) + \(H_2SO_4\)

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