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Rohan took 10 mL of freshly prepared iron sulphate solution in four different test tubes and added four different metal strips to each test tube as shown below :ln test tubes I and llI, black residue was obtained while in test tubes ll and lV, no change was observed. Metals P, Q, R and S could be respectively (A) Al, Cu, Pb, As(B) Pb, Cu, Ag, Al (C) Zn, Al, Cu, Ag (D) Zn, Cu, Al, Ag. |
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Answer» Correct option (D) Zn, Cu, Al, Ag. Explanation: Black residue is obtained in test tubes I and lll i.e., iron gets displaced in test tubes I and lll. Therefore, metals P and R should be more reactive than iron. No change is observed in test tubes ll and lV hence, metals Q and S should be less reactive than iron. |
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