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CBSE Class 10 Science Question 17 of 46

Solved 2023 Question Paper CBSE Class 10 Science — Question 17

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Question 17

Assertion (A) : The colour of aqueous solution of copper sulphate turns colourless when a piece of lead is added to it.

Reason (R) : Lead is more reactive than copper, and hence displaces copper from its salt solution.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
  3. (A) is true, but (R) is false.
  4. (A) is false, but (R) is true.
Answer

Both (A) and (R) are true and (R) is the correct explanation of (A)

Reason — When a piece of lead is added to an aqueous solution of copper sulphate, a displacement reaction takes place as lead is more reactive than copper hence lead displaces copper from the copper sulphate solution. The chemical equation for the reaction is:

Pb + CuSO4 ⟶ PbSO4 + Cu

This results in a colorless solution [PbSO4].