(A) : Successive ionization enthalpies of an atom would be the order IE₁ < IE₂< IE₃.
(R) : Metals have low ionisation enthalpies while non-metals have high ionization enthalpies

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(A) is true but (R) is false

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

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

answer is B.

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Detailed Solution

IE₁ < IE₂< IE₃, because, After the removal of each successive electron, remaining electrons are held more tightly by the nucleus, So removal of the next electron becomes difficult.

Non-metals have high ionization energy because they have small atomic radii.

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