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ICSE Class 9 Chemistry Question 16 of 18

Chemical Changes and Reactions — Question 17

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17
Question

Question 2(v)

Assertion (A): Chlorine can displace iodide ions from KI solution.

Reason (R): It is an example of displacement reaction.

  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 but R is not the correct explanation of A.

Explanation — Chlorine is more active non-metal when compared to iodine. In the reactivity series of non-metals, chlorine is placed above iodine. Hence, chlorine displaces iodine from potassium iodide solution. Hence, the assertion (A) is true.

2KI + Cl2 ⟶ 2KCI + I2

Above reaction is displacement reaction in which a more active element chlorine displaces a less active element iodine from its salt solution. Hence the reason (R) is true.

However reason (R) does not explain about reactivity of chlorine and position of chlorine and iodine in reactivity series. Hence reason (R) is not a correct explanation of assertion (A).