JEE Main 2023 — Chemistry Inorganic Chemistry

2023mcqeasy

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

Assertion A : The energy required to form ${\mathrm{Mg}}^{2+}$ from $\mathrm{Mg}$ is much higher than that required to produce ${\mathrm{Mg}}^{+}$

Reason R: ${\mathrm{Mg}}^{2+}$ is small ion and carry more charge than ${\mathrm{Mg}}^{+}$

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

Official previous-year question

Held on 10 Apr 2023 · Verified 6 Jul 2026.

Options

A
Both A and R are true but R is NOT 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 and R is the correct explanation of A

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Solution

Mg have $2$ electrons in valance shell and after donation of $2$ electrons it converts into ${\mathrm{Mg}}^{2+}$ ion and attains inert gas configuration, now to ionize one more electron from inert gas configuration is very difficult, hence it is easy to ionize $\mathrm{Mg}$ to ${\mathrm{Mg}}^{2+}$ . ${\mathrm{IE}}_{2}$ is always greater than ${\mathrm{IE}}_{1}$ because on removal of ${e}^{-}$ , size decreases and effective nuclear charge increases.So Assertion is correct.

${\mathrm{Mg}}^{2+}$ is a smaller ion than ${\mathrm{Mg}}^{+}$ and has a greater charge density. This means that ${\mathrm{Mg}}^{2+}$ has a stronger attraction to its electrons than ${\mathrm{Mg}}^{+}$ and requires more energy to remove an electron from it. So reason is also correct.

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Solution

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

Keep practicing Inorganic Chemistry

JEE Main 2023 — Chemistry Inorganic Chemistry

Options

Did you get this right?

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

Keep practicing Inorganic Chemistry