zinc strip is added to two test tubes – Discussion Forum

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Piyush365

Asked: September 30, 2025In: Class 10 Science

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.

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. class 10 science ...