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Study the given experimental set-up. If...

Study the given experimental set-up.

If in test tubes `I` and `III`, black residue was obtained and in test tubes `II` and `IV`, no change was observed, then metals `P, Q, R` and `S` could be respectively

A

`Al, Cu, Pb, Ag`

B

`Pb, Cu, Ag, Al`

C

`Zn, Al, Cu,Ag`

D

`Zn, Cu, Al, Ag`

Text Solution

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The correct Answer is:
D
Black residue is obtained in test tubes and III i.e., iron gets displaced in test tubes I and IIl Therefore, metals P and R should be more reactive than iron. No change is observed in test tubes II and IV hence, metals Q and S should be less reactive than iron.
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