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A student takes Cu, Al, Fe and Zn piees ...

A student takes `Cu, Al, Fe` and `Zn` piees separtely in four test tubes labelled as I,II, III and IV respectively. He adds `10mL` of freshly prepared ferrous sulphate solution to each test tube observes the colour of the metal residue in each case.

He would observe a black residue in the test tube:

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