NDA 2026 Chemistry question
Consider the following pairs : Chemical Reaction : Type of Chemical Reaction I. Fe\,(s) + CuSO_4\,(aq.) \rightarrow FeSO_4\,(aq.) + Cu\,(s) : Displacement reaction II. Na_2SO_4\,(aq.) + BaCl_2\,(aq.) \rightarrow BaSO_4\,(s) + 2NaCl\,(aq.) : Double displacement reaction III. Fe_2O_3\,(s) + 3CO\,(g) \rightarrow 2Fe\,(s) + 3CO_2\,(g) : Redox reaction IV. : Thermal decomposition reaction How many of the pairs given above are correctly matched ?
Answer: (D)
Solution
Iron displaces copper from copper sulphate (displacement); sodium sulphate and barium chloride exchange ions (double displacement);
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