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ICSE Class 10 Chemistry Question 11 of 62

Study of Compounds — Sulphuric Acid — Question 17

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17
Question

Question 17

Assertion (A): Pure sulphuric acid is almost a non-conductor of electricity.

Reason (R): Dilute sulphuric acid is a good conductor of electricity.

  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— Pure (concentrated) H2SO4 is not ionized significantly because no water is present to dissociate it into ions. Therefore, it does not conduct electricity. Hence, the assertion (A) is true.
When H2SO4 is diluted with water, it ionizes completely to give H- and SO42- ions, which are free to move. These ions carry electric current, making it a strong electrolyte. Hence, the reason (R) is true.

However, reason (R) does not explain why pure sulphuric acid is a poor conductor of electricity. Hence, reason (R) is not the correct explanation of assertion (A).