Question

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

Answer 1

Answer:

Test tubes having aluminium and zinc metal strip will obtain a black residue of iron because these two metals are more reactive than iron and will easily displace iron from its chemical reaction. Equations for the reaction follows: Hence, the correct answer is Option a.