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ICSE Class 10 Chemistry Question 11 of 63

Study of Compounds — Nitric Acid — Question 18

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18
Question

Question 18

Assertion (A): The yellow colour of nitric acid is removed by using carbon dioxide gas or dry air.

Reason (R): Carbon dioxide gas or dry air drives away NO2 gas from the warm nitric acid.

  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.

Explanation — The yellow colour of nitric acid is removed by bubbling carbon dioxide gas or dry air into it. Hence, the assertion (A) is true.
The yellow colour will disappear because carbon dioxide gas or dry air drive out NO2 gas from the warm nitric acid. Hence, the reason (R) is true.

Reason (R) explains how the use of carbon dioxide and dry air turn yellow colour nitric acid into a colourless compound. Hence, reason (R) is a correct explanation of assertion (A).