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Piyush365
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Asked: 2025-09-30T04:13:40+00:00 In:

A zinc strip is added to two test tubes: test tube ‘P’ contains aqueous copper sulphate (CuSO4) and test tube Q contains aqueous magnesium sulphate MgSO4. Which of the following observations is correct? (a) In test tube ‘P’, zinc strip is coated with a red – brown layer, while in ‘Q’ there is no reaction. (b) Zinc strip turns black in ‘P’ and develops a white coating in ‘Q’. (c) Bubbles are observed in both test tubes ‘P’ and ‘Q’. (d) There is no reaction in either test tube.

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The correct observation is (a). In test tube P, zinc displaces copper from copper sulphate, forming a red-brown copper layer on the strip. In test tube Q, no reaction occurs as zinc cannot displace magnesium from magnesium sulphate.

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    1. ANSWER: [A]

      Explanation: In test tube P: Copper sulphate solution  reacts with zinc (Zn), because zinc is more reactive than copper. Zinc displaces copper from and copper is deposited as a red-brown coating on the zinc strip.

      In test tube Q: Magnesium sulphate solution does not react with zinc because zinc is less reactive than magnesium, so no displacement occurs.

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