1.

(A) First ionisation potential of helium is highest (R) The electron gain enthalpy of helium is taken as zero

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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 :B


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