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NEET levelSingle correct optionDifficulty 1 of 3pt115

For any element, the successive ionisation enthalpies follow the order

A $Δ_{i} H_{1} = Δ_{i} H_{2} = Δ_{i} H_{3}$
B $Δ_{i} H_{2} < Δ_{i} H_{1} < Δ_{i} H_{3}$
C $Δ_{i} H_{1} > Δ_{i} H_{2} > Δ_{i} H_{3}$
D $Δ_{i} H_{1} < Δ_{i} H_{2} < Δ_{i} H_{3}$

Answer: D

After each electron is removed the remaining electrons feel a larger effective nuclear charge with less repulsion, so each next electron is held more strongly. Hence the enthalpies increase in the order 1st < 2nd < 3rd.

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