(A) The first ionisation enthalpy of group-$13$ elements does not decrease regularly down the group due to the poor shielding effect of $d$ and $f$ or

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(A) The first ionisation enthalpy of group-$13$ elements does not decrease regularly down the group due to the poor shielding effect of $d$ and $f$ orbitals. The observed order is $B > Tl > Ga > Al > In$. Boron $(B)$ has the highest value due to its small size. Thallium $(Tl)$ has a higher ionisation enthalpy than Indium $(In)$ and Aluminium $(Al)$ due to the lanthanoid contraction,which increases the effective nuclear charge.

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

Easy

The correct order of first ionisation enthalpy of group-$13$ elements is

AP EAMCET 2017 All AP EAMCET

A
$B > Tl > Ga > Al > In$
B
$B > Al > Ga > In > Tl$
C
$B > Ga > Al > In > Tl$
D
$B > Tl > Al > Ga > In$

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Class 11 Questions

Class 11

Chemistry Questions

Chapter

Classification of Elements and Periodicity in Properties

Subtopic

Ionisation energy

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AP EAMCET 2017 Paper All AP EAMCET years →

Which is the correct order of ionization energies?

Difficult

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The sum of $IE_1 + IE_2$ and $IE_3 + IE_4$ for elements $P$ and $Q$ are given below:

Element $IE_1 + IE_2$ $(kJ/mol)$ $IE_3 + IE_4$ $(kJ/mol)$

$P$ $2.45$ $8.82$

$Q$ $2.85$ $6.11$

Then,according to the given information,the incorrect statement$(s)$ is/are:

Element	$IE_1 + IE_2$ $(kJ/mol)$	$IE_3 + IE_4$ $(kJ/mol)$
$P$	$2.45$	$8.82$
$Q$	$2.85$	$6.11$

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The order of the magnitude of first ionisation potentials of $Be$,$B$,$N$ and $O$ is

Easy

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For one of the elements,various successive ionization enthalpies (in $kJ \cdot mol^{-1}$) are given below:

$I.E.$ $1^{st}$ $2^{nd}$ $3^{rd}$ $4^{th}$ $5^{th}$

Value $577.5$ $1810$ $2750$ $11580$ $14820$

The element is:

MediumKCET 2015

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

Medium

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$I.E.$	$1^{st}$	$2^{nd}$	$3^{rd}$	$4^{th}$	$5^{th}$
Value	$577.5$	$1810$	$2750$	$11580$	$14820$

The correct order of first ionisation enthalpy of group-$13$ elements is

Similar Questions

Which is the correct order of ionization energies?

The sum of $IE_1 + IE_2$ and $IE_3 + IE_4$ for elements $P$ and $Q$ are given below: Element $IE_1 + IE_2$ $(kJ/mol)$ $IE_3 + IE_4$ $(kJ/mol)$ $P$ $2.45$ $8.82$ $Q$ $2.85$ $6.11$ Then,according to the given information,the incorrect statement$(s)$ is/are:

The order of the magnitude of first ionisation potentials of $Be$,$B$,$N$ and $O$ is

For one of the elements,various successive ionization enthalpies (in $kJ \cdot mol^{-1}$) are given below: $I.E.$ $1^{st}$ $2^{nd}$ $3^{rd}$ $4^{th}$ $5^{th}$ Value $577.5$ $1810$ $2750$ $11580$ $14820$ The element is:

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

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The sum of $IE_1 + IE_2$ and $IE_3 + IE_4$ for elements $P$ and $Q$ are given below:

Element $IE_1 + IE_2$ $(kJ/mol)$ $IE_3 + IE_4$ $(kJ/mol)$

$P$ $2.45$ $8.82$

$Q$ $2.85$ $6.11$

Then,according to the given information,the incorrect statement$(s)$ is/are:

For one of the elements,various successive ionization enthalpies (in $kJ \cdot mol^{-1}$) are given below:

$I.E.$ $1^{st}$ $2^{nd}$ $3^{rd}$ $4^{th}$ $5^{th}$

Value $577.5$ $1810$ $2750$ $11580$ $14820$

The element is: