Four elements are given, choose the correct order of their first ionisation potential : a. $1 s^2, 2 s^2 2 p^6 3 s^1$ b. $1 s^2, 2 s^2 2 p^6 3 s^2 3 p^6$ c. $1 s^2, 2 s^2 2 p^6 3 s^2 3 p^2$ d. $1 s^2, 2 s^2 2 p^6 3 s^2 3 p^1$

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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Four elements are given, choose the correct order of their first ionisation potential :

a.

1 s^2, 2 s^2 2 p^6 3 s^1

1 s^2, 2 s^2 2 p^6 3 s^2 3 p^6

1 s^2, 2 s^2 2 p^6 3 s^2 3 p^2

1 s^2, 2 s^2 2 p^6 3 s^2 3 p^1

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Correct option: C

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Option C (b > c > d > a) is correct because ionization potential generally increases across a period and decreases down a group. Noble gases have the highest ionization potential, followed by elements with stable electronic configurations.

JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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