10 mL of freshly prepared iron sulphate was taken in each of four testtubes. Strips of copper, iron, zinc and aluminium were introduced,each metal in a different test tube. A black residue was obtained in two test tube. The right pair ofmetals forming the precipitates is
a. copper and zinc b.aluminium and copper
c. iron and aluminium d.zinc and aluminium
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Answer:
zinc and aluminum as only they can displace iron
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