question_answer

  10 mL of freshly prepared iron sulphate was taken in each of four test tubes. Strips of copper, iron, zinc and aluminium was introduced, each metal in a different test tube. A residue was obtained in two of them. The right pair of metals forming the precipitates is           

Answer:

                  Zinc (Zn) and Aluminium (Al). Zn and Al are more reactive than iron, but copper is less reactive than iron.