Aqueous solutions of zinc sulphate and iron sulphate were taken in the test tubes I and II by four students. A, B, C, and D. Metal pieces of iron and zinc were dropped in the two solutions and observations made after several hours and recorded in the form of a table as given below:

AcademicChemistryNCERTClass 10

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Correct answer: (3) C

Explanation: When iron is treated with zinc sulphate, no reaction takes place because iron is less reactive than zinc.

When zinc is treated with iron sulphate, the green colour solution becomes colourless and a black residue of iron is obtained. Hence, the observations made by student C is correct.

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Updated on: 10-Oct-2022

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