(D) The first ionization energy of $N$ $(1s^2, 2s^2, 2p^3)$ is higher than that of $O$ $(1s^2, 2s^2, 2p^4)$ because $N$ has a stable,exactly half-fill

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If both the Assertion and Reason are incorrect.

(D) The first ionization energy of $N$ $(1s^2, 2s^2, 2p^3)$ is higher than that of $O$ $(1s^2, 2s^2, 2p^4)$ because $N$ has a stable,exactly half-filled $2p$ subshell. Across a period,the effective nuclear charge increases,not decreases,due to the addition of protons in the same shell while shielding remains relatively constant. Therefore,the Assertion is incorrect and the Reason is also incorrect.

Class 11 Chemistry Classification of Elements and Periodicity in Properties Ionisation energy

Medium

Assertion : First ionization energy for nitrogen is lower than oxygen.
Reason : Across a period effective nuclear charge decreases.

AIIMS 2005 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.

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Class 11

Chemistry Questions

Chapter

Classification of Elements and Periodicity in Properties

Subtopic

Ionisation energy

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AIIMS 2005 Paper All AIIMS years →

The $IE_1$ and $IE_2$ of three elements $A$,$B$,and $C$ are given as : ( $IE$ in $kJ/mol$ )

Element $A, B, C$

$IE_1$ $400, 550, 1150$

$IE_2$ $2650, 1070, 2090$

Identify the element which represents a nonmetal.

Element	$A, B, C$
$IE_1$	$400, 550, 1150$
$IE_2$	$2650, 1070, 2090$

Medium

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Which of the following is the correct order of increasing second ionization energy?

Easy

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"On moving left to right,ionization energy increases due to increasing $Z_{eff}$." In which of the following pairs is the above statement $NOT$ $CORRECT$?

Difficult

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Which of the following is not the correct increasing order of ionisation energy?

Easy

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Explain why there is a phenomenal decrease in ionisation enthalpy from carbon to silicon.

Medium

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Assertion : First ionization energy for nitrogen is lower than oxygen.Reason : Across a period effective nuclear charge decreases.

Similar Questions

The $IE_1$ and $IE_2$ of three elements $A$,$B$,and $C$ are given as : ( $IE$ in $kJ/mol$ ) Element $A, B, C$ $IE_1$ $400, 550, 1150$ $IE_2$ $2650, 1070, 2090$ Identify the element which represents a nonmetal.

Which of the following is the correct order of increasing second ionization energy?

"On moving left to right,ionization energy increases due to increasing $Z_{eff}$." In which of the following pairs is the above statement $NOT$ $CORRECT$?

Which of the following is not the correct increasing order of ionisation energy?

Explain why there is a phenomenal decrease in ionisation enthalpy from carbon to silicon.

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Assertion : First ionization energy for nitrogen is lower than oxygen.
Reason : Across a period effective nuclear charge decreases.

The $IE_1$ and $IE_2$ of three elements $A$,$B$,and $C$ are given as : ( $IE$ in $kJ/mol$ )

Element $A, B, C$

$IE_1$ $400, 550, 1150$

$IE_2$ $2650, 1070, 2090$

Identify the element which represents a nonmetal.