CBSE Class 10 Sample Paper Science Solution - For 2023 Boards

On placing a copper coin in a test tube containing green ferrous sulphate solution, it will be observed that the ferrous sulphate solution

 

  1. turns blue, and a grey substance is deposited on the copper coin.
  2. turns colourless and a grey substance is deposited on the copper coin.
  3. turns colourless and a reddish–brown substance is deposited on the copper coin.
  4. remains green with no change in the copper coin.

 

Answer:

  • A displacement reaction is a reaction in which a more reactive element takes the place of a less reactive element in a chemical compound. 
  • Copper metal is less reactive than Iron. 
  • So, when copper is added to the ferrous (Iron) sulphate solution, no reaction takes place .

Reaction between FeSO4 and Cu - Teachoo.jpg

Therefore, the correct answer is (d) Ferrous sulphate solution remains green with no change in the copper coin.

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo