1.

(A) Helium is regarded as the least volatile of all liquids.(R) The boiling point of liquid helium is 4.2 K which is the highest of all known liquids.

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Both (A) and (R) are true and (R) is the CORRECT EXPLANATION of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is false
Both (A) and (R) are false

Answer :D


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