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NEET CHEMISTRYThe d-and f-Block ElementsMedium

Question

Identify the incorrect statement among the following:

A

There is a decrease in the radii of the atoms or ions as one proceeds from La\text{La} to Lu\text{Lu}.

B

Lanthanoid contraction is the accumulation of successive shrinkages.

C

As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.

D

Shielding power of 4f electrons is quite weak.

Step-by-Step Solution

The statement 'As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements' is incorrect. In fact, due to lanthanoid contraction, the atomic radii of the elements of the second (4d) and third (5d) transition series are virtually the same (e.g., Zr=160 pm\text{Zr} = 160 \text{ pm} and Hf=159 pm\text{Hf} = 159 \text{ pm}). Because of this similarity in size, they exhibit very similar physical and chemical properties and often occur together in nature, making their separation difficult.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from The d-and f-Block Elements. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYThe d-and f-Block Elementsidentifyincorrectstatementfollowing

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

A.$d^5$ to $d^2$ configuration
B.$d^4$ to $d^5$ configuration
C.$d^3$ to $d^5$ configuration
D.$d^5$ to $d^4$ configuration
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The catalytic activity of transition metals is due to:

A.High enthalpy of atomization
B.Paramagnetic behaviour
C.Colour of hydrated ions
D.Variable oxidation states
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The manganate and permanganate ions are tetrahedral, due to:

A.The π-bonding involves the overlap of d-orbitals of oxygen with d-orbitals of manganese.
B.The π-bonding involves the overlap of p-orbitals of oxygen with d-orbitals of manganese.
C.Absence of π-bonding.
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The incorrect statement among the following is:

A.Lanthanoids are good conductors of heat and electricity.
B.Actinoids are highly reactive metals, especially when finely divided.
C.Actinoid contraction is greater for element to element than Lanthanoid contraction.
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Acidified $K_2Cr_2O_7$ solution turns green when $Na_2SO_3$ is added to it. This is due to the formation of:

A.$CrO_4^{2-}$
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A.$La^{3+} (Z=57)$
B.$Ti^{3+} (Z=22)$
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Which of the following ions displays the d-d transition and paramagnetism?

A.$\text{CrO}_4^{2-}$
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C.$\text{MnO}_4^-$
D.$\text{MnO}_4^{2-}$
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