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A student takes Copper, Aluminium, Iron and Zinc metals separately in four test tubes labelled as I, II, III and IV respectively, He adds 10 ml of freshly prepared Ferrous Sulphate solution to each test tube and observes the colour of the metal residue in each case. He would observe a brown residue in the test tubes. Identify the test tubes with brown residue.

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I and II

I and III

II and III

II and IV

answer is D.

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Detailed Solution

As per metal activity series Al and Zn, both are highly reactive metals than Fe of Ferrous Sulphate solution. So Al and Zn easily replaces ‘Fe’ from its Sulphate solution and deposits brown residue in test tubes II and IV.

Test tube (II): $2 A l_{(s)} + F e S O_{4 (a q)} \to A l_{2} {(S O_{4})}_{3 (a q)} + \underset{b r o w n}{3 F e_{(s)}}$

Test tube (IV): $Z n_{(s)} + F e S O_{4 (a q)} \to Z n S O_{4 (a q)} + \underset{b r o w n}{F e_{(s)}}$

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