NEET UG 2009 — Chemistry Inorganic Chemistry

2009mcqeasy

Amongst the elements with following electronic configurations, which one of them may have the highest ionisation energy ?

Official previous-year question

Held on 30 Apr 2009 · Verified 9 Jul 2026.

Options

A
$[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^3$
B
$[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^2$
C
$[\mathrm{Ar}] 3 \mathrm{~d}^{10}, 4 \mathrm{~s}^2 4 \mathrm{p}^3$
D
$[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^1$

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Solution

Key Idea Ionisation energy usually increases from left to right in a period with decrease in atomic size and decreases from upto down in a group with increase in atomic size. $\begin{array}{lc}\text { Electronic configuration } & \text { Group } \\ {[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^3} & \mathrm{~V} \\ {[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^2} & \text { IV } \\ {[\mathrm{Ar}] 3 \mathrm{~d}^{10}, 4 \mathrm{~s}^2, 4 \mathrm{p}^3} & \mathrm{~V} \\ {[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^1} & \text { III }\end{array}$ Since IE increases in a period and decreases in a group, [Ne] $3 s^2 3 \mathrm{p}^3$ configuration has the highest ionisation energy among the given.

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NEET UG 2009 — Chemistry Inorganic Chemistry

2009mcqeasy

Amongst the elements with following electronic configurations, which one of them may have the highest ionisation energy ?

Official previous-year question

Held on 30 Apr 2009 · Verified 9 Jul 2026.

Options

A
$[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^3$
B
$[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^2$
C
$[\mathrm{Ar}] 3 \mathrm{~d}^{10}, 4 \mathrm{~s}^2 4 \mathrm{p}^3$
D
$[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^1$

Did you get this right?

Solution

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NEET UG Inorganic Chemistry in other years

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Work through every NEET UG Inorganic Chemistry PYQ, year by year.

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NEET UG 2009 — Chemistry Inorganic Chemistry

Options

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Solution

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NEET UG Inorganic Chemistry in other years

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Physical Chemistry

Organic Chemistry

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NEET UG 2009 — Chemistry Inorganic Chemistry

Options

Did you get this right?

Solution

Your note

NEET UG Inorganic Chemistry in other years

More NEET UG Inorganic Chemistry questions

Other Chemistry topics for NEET UG

Physical Chemistry

Organic Chemistry

Keep practicing Inorganic Chemistry