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A: Helium shows only positive deviation ...

A: Helium shows only positive deviation from ideal behaviour.
R : Helitim is a noble gas

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)

C

If Assertion is true statement but Reason is false, then mark (3)

D

If both Assertion and Reason are false statements, then mark (4)

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the given statements regarding helium and its behavior as a gas, we will break down the assertion (A) and reason (R) step by step. ### Step-by-Step Solution: 1. **Understanding the Assertion (A)**: - The assertion states that "Helium shows only positive deviation from ideal behavior." - In the context of gas laws, an ideal gas follows the ideal gas equation (PV = nRT) without deviations. However, real gases can deviate from this behavior due to intermolecular forces and the volume occupied by gas molecules. - Positive deviation indicates that the gas behaves less ideally than predicted, meaning it has a higher pressure than expected at a given volume and temperature. 2. **Understanding the Reason (R)**: - The reason states that "Helium is a noble gas." - Noble gases, including helium, are known for their low reactivity and have complete valence electron shells. This characteristic often leads to weak intermolecular forces (like van der Waals forces) among noble gas atoms. 3. **Analyzing the Relationship Between A and R**: - While it is true that helium shows positive deviation from ideal behavior, the reason provided (that it is a noble gas) does not directly explain why helium exhibits this positive deviation. - Positive deviation is generally attributed to the weak intermolecular forces present in gases, but the noble gas property alone does not account for the observed behavior. 4. **Conclusion**: - Both the assertion (A) and the reason (R) are true statements, but the reason does not correctly explain the assertion. Therefore, the correct answer is that both statements are true, but the reason is not the correct explanation for the assertion. ### Final Answer: The correct option is that both A and R are true, but R is not the correct explanation for A.
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