JEE Main Chemistry question

**Assertion:** Helium is the only substance that cannot be solidified at atmospheric pressure. **Reason:** The zero-point energy of helium is very high.

(A)Assertion is True, Reason is True; Reason is correct explanation for AssertionCorrect
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is True

Answer: (A)

Solution

Helium remains liquid even at absolute zero under ordinary (1 atm) pressure, requiring an applied pressure of about 25 atm to solidify it — a unique behaviour among all substances. This is precisely because helium's very light atomic mass and weak interatomic

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Question ID VK-146081