NEET 2024 | d and f Block Elements Question 8 | Chemistry

NEET 2024

MCQ (Single Correct Answer)

-1

The $$\mathrm{E}^{\circ}$$ value for the $$\mathrm{Mn}^{3+} / \mathrm{Mn}^{2+}$$ couple is more positive than that of $$\mathrm{Cr}^{3+} / \mathrm{Cr}^{2+}$$ or $$\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}$$ due to change of

$$d^5$$ to $$d^4$$ configuration

$$d^5$$ to $$d^2$$ configuration

$$d^4$$ to $$d^5$$ configuration

$$d^3$$ to $$d^5$$ configuration

NEET 2024

MCQ (Single Correct Answer)

-1

The pair of lanthanoid ions which are diamagnetic is

$$\mathrm{Ce}^{4+}$$ and $$\mathrm{Yb}^{2+}$$

$$\mathrm{Ce}^{3+}$$ and $$\mathrm{Eu}^{2+}$$

$$\mathrm{Gd}^{3+}$$ and $$\mathrm{Eu}^{3+}$$

$$\mathrm{Pm}^{3+}$$ and $$\mathrm{Sm}^{3+}$$

NEET 2023 Manipur

MCQ (Single Correct Answer)

-1

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

Assertion (A) : Ionisation enthalpy increases along each series of the transition elements from left to right. However, small variations occur.

Reason (R) : There is corresponding increase in nuclear charge which accompanies the filling of electrons in the inner d-orbitals.

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

(A) is correct but (R) is not correct.

(A) is not correct but (R) is correct.

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

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

NEET 2023 Manipur

MCQ (Single Correct Answer)

-1

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

Assertion (A) : Ionisation enthalpies of early actinoids are lower than for early lanthanoids.

Reason (R) : Electrons are entering 5f orbitals in actinoids which experience greater shielding from nuclear charge.

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

(A) is true but (R) is false.

(A) is false but (R) is true.

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

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

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