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 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:

(D) Both A and R are true and R is the correct explanation of A.

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

JEE Main · 2023 · 10 Apr 2023 · Shift 2 · Classification of Elements and Periodicity

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

Mg^{2 +}

from Mg is much higher than that required to produce

Mg^{+}

.
Reason R:

Mg^{2 +}

is small ion and carry more charge than

Mg^{+}

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

(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.✓ Correct

Answer: (D)

Solution

Both statements are correct. The second ionization energy of Mg is much higher than the first because removing an electron from

Mg^{+}

(which is smaller and more positively charged) requires significantly more energy due to increased effective nuclear charge. The reason correctly explains why successive ionization energies increase.

JEE Main · 2023 · 10 Apr 2023 · Shift 2 · Single correct option

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JEE Main · 2023 · 10 Apr 2023 · Shift 2 · Classification of Elements and Periodicity

Solution

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