JEE Main 2023 — Chemistry Inorganic Chemistry

2023mcqmedium

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): The first ionization enthalpy of $3d$ series elements is more than that of group $2$ metals

Reason (R): In $3d$ series of elements successive filling of $d$ -orbitals takes place.

In the light of the above statements, choose the correct answer from the options given below:

Official previous-year question

Held on 31 Jan 2023 · Verified 6 Jul 2026.

Options

A
Both (A) and (R) are true and (R) is the correct explanation of (A)
B
(A) is true but (R) is false
C
(A) is false but (R) is true
D
Both (A) and (R) are true but (R) is not the correct explanation of (A)

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Solution

Metal	$\mathrm{Sc}$	$\mathrm{Ti}$	$V$	$\mathrm{Cr}$	$\mathrm{Mn}$	$\mathrm{Fe}$	$\mathrm{Co}$	$\mathrm{Ni}$	$\mathrm{Cu}$	$\mathrm{Zn}$
IE $(\mathrm{kJ}/\mathrm{mol})$	$631$	$656$	$650$	$653$	$717$	$762$	$758$	$736$	$745$	$906$

Metal	$\mathrm{Be}$	$\mathrm{Mg}$	$\mathrm{Ca}$	$\mathrm{Sr}$	$\mathrm{Ba}$	$\mathrm{Ra}$
IE $(\mathrm{kJ}/\mathrm{mol})$	$899$	$737$	$590$	$549$	$503$	$509$

In the first transition series, the first and second ionization enthalpy values increase slowly on moving across the period. As the nuclear charge rises, the interaction between the nucleus and valence electrons increases, and as a result, the ionization enthalpy increases. So, Sc has the lowest value of ionization enthalpy while Zn has the highest value of ionization enthalpy.

So, both assertion and reasons are true and reason is the correct expalantion of assertion.

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Solution

Metal	$\mathrm{Sc}$	$\mathrm{Ti}$	$V$	$\mathrm{Cr}$	$\mathrm{Mn}$	$\mathrm{Fe}$	$\mathrm{Co}$	$\mathrm{Ni}$	$\mathrm{Cu}$	$\mathrm{Zn}$
IE $(\mathrm{kJ}/\mathrm{mol})$	$631$	$656$	$650$	$653$	$717$	$762$	$758$	$736$	$745$	$906$

Metal	$\mathrm{Be}$	$\mathrm{Mg}$	$\mathrm{Ca}$	$\mathrm{Sr}$	$\mathrm{Ba}$	$\mathrm{Ra}$
IE $(\mathrm{kJ}/\mathrm{mol})$	$899$	$737$	$590$	$549$	$503$	$509$

So, both assertion and reasons are true and reason is the correct expalantion of assertion.

JEE Main 2023 — Chemistry Inorganic Chemistry

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JEE Main 2023 — Chemistry Inorganic Chemistry

Options

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Solution

Your note

JEE Main Inorganic Chemistry in other years

More JEE Main Inorganic Chemistry questions

Other Chemistry topics for JEE Main

Physical Chemistry

Organic Chemistry

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