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Assertion :- On cooling ,ammonia lirqui...

Assertion :- On cooling ,ammonia lirquifies first whereas `CO_(2)` requires more cooling.
Reason :- Critical temperatures of ammonia and carbon dioxide are 405.5 K and 304.10 K respectively.

A

If both assertion and reason are true and reason is the correct explanation of assertion .

B

If both assertion and reason are true but reason is not the correct explanation of assertion .

C

If assertion is true but reason is false .

D

If both assertion and reason are false .

Text Solution

AI Generated Solution

The correct Answer is:
To solve the given assertion and reason question, we will follow these steps: ### Step 1: Understand the Assertion The assertion states that "On cooling, ammonia liquefies first whereas CO₂ requires more cooling." This means that when both gases are cooled, ammonia will change from gas to liquid at a higher temperature compared to carbon dioxide. ### Step 2: Understand the Reason The reason provided states the critical temperatures of ammonia and carbon dioxide: "Critical temperatures of ammonia and carbon dioxide are 405.5 K and 304.10 K respectively." The critical temperature is the temperature above which a gas cannot be liquefied, regardless of the pressure applied. ### Step 3: Analyze the Critical Temperatures - **Ammonia (NH₃)** has a critical temperature of **405.5 K**. - **Carbon Dioxide (CO₂)** has a critical temperature of **304.10 K**. ### Step 4: Compare the Critical Temperatures Since ammonia has a higher critical temperature than carbon dioxide, it means that ammonia can be liquefied at a higher temperature compared to carbon dioxide. Therefore, when cooling, ammonia will reach its liquefaction point before carbon dioxide does. ### Step 5: Conclusion Both the assertion and the reason are true: - The assertion is correct because ammonia liquefies first upon cooling. - The reason is correct because it explains why ammonia liquefies first due to its higher critical temperature. ### Final Answer Both assertion and reason are true, and the reason is the correct explanation for the assertion.
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