Question:
Identify a pair of gases from following that does not obey Henry's law.
Identify a pair of gases from following that does not obey Henry's law.
Show Hint
Gases that react with water, such as ammonia and carbon dioxide, do not follow Henry law.
Updated On: Oct 1, 2026
- \(\text{NH}_3\) and \(\text{CO}_2\)
- \(\text{CO}_2\) and \(\text{O}_2\)
- \(\text{NH}_3\) and \(\text{N}_2\)
- \(\text{N}_2\) and \(\text{CH}_4\)
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Henry law says the solubility of a gas in a liquid is proportional to its partial pressure. It holds only when the gas does not react with the solvent.
Step 2: Detailed Explanation:
Ammonia reacts with water to give \(\text{NH}_4^+\) and \(\text{OH}^-\). Carbon dioxide reacts with water to give carbonic acid. Their solubility is far more than the law predicts.
Oxygen, nitrogen and methane dissolve physically in water without reacting, so they follow Henry law.
Step 3: Check the options.
(A) NH\(_3\) and CO\(_2\): both react, so the pair does not obey. (B) CO\(_2\) with O\(_2\): O\(_2\) obeys, so not both disobey. (C) NH\(_3\) with N\(_2\) and (D) N\(_2\) with CH\(_4\) each contain a gas that obeys.
Final Answer:
Both gases in option (A) react with water, so they deviate from Henry law. \[ \boxed{\text{(A)}} \]
Henry law says the solubility of a gas in a liquid is proportional to its partial pressure. It holds only when the gas does not react with the solvent.
Step 2: Detailed Explanation:
Ammonia reacts with water to give \(\text{NH}_4^+\) and \(\text{OH}^-\). Carbon dioxide reacts with water to give carbonic acid. Their solubility is far more than the law predicts.
Oxygen, nitrogen and methane dissolve physically in water without reacting, so they follow Henry law.
Step 3: Check the options.
(A) NH\(_3\) and CO\(_2\): both react, so the pair does not obey. (B) CO\(_2\) with O\(_2\): O\(_2\) obeys, so not both disobey. (C) NH\(_3\) with N\(_2\) and (D) N\(_2\) with CH\(_4\) each contain a gas that obeys.
Final Answer:
Both gases in option (A) react with water, so they deviate from Henry law. \[ \boxed{\text{(A)}} \]
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