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NEET CHEMISTRYThe d-and f-Block ElementsMedium

Question

Match the statements given in List-I with the corresponding element given in List-II:

List-I (Characteristics) (a) Element that exhibits +3 oxidation state only. (b) An element that exhibits a greater number of oxidation states. (c) Element which is a reducing agent in its +2 oxidation state. (d) An element that is not considered as a transition element.

List-II (Elements) (i) Mn (ii) Zn (iii) Sc (iv) Cr

Choose the correct answer from the options given below:

A

(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

B

(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

C

(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)

D

(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

Step-by-Step Solution

Let us match the characteristics with the respective elements: (a) Scandium (Sc) exhibits only a +3 oxidation state because losing its three valence electrons gives it a highly stable noble gas configuration . (b) Manganese (Mn) gives the greatest number of oxidation states (from +2 to +7) due to the involvement of maximum unpaired electrons in its 3d3d and 4s4s orbitals . (c) Chromium (Cr) acts as a strong reducing agent in its +2 oxidation state (Cr2+Cr^{2+}) because its oxidation to Cr3+Cr^{3+} changes its configuration from d4d^4 to a highly stable half-filled t2g3t_{2g}^3 configuration . (d) Zinc (Zn) is not considered a transition metal because it has a completely filled d10d^{10} electronic configuration in its ground state as well as in its common oxidation state (+2) . Therefore, the correct match is (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii).

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 Elementsstatementscorrespondingelementlistiicharacteristics

More The d-and f-Block Elements Questions

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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
EasySolve

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.
D.The π-bonding involves the overlap of p-orbitals of oxygen with p-orbitals of manganese.
MediumSolve

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.
D.Most of the trivalent Lanthanoid ions are colourless in the solid-state.
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When neutral or faintly alkaline $KMnO_4$ is treated with potassium iodide, iodide ion is converted into 'X'. 'X' is:

A.$I_2$
B.$IO_4^-$
C.$IO_3^-$
D.$IO^-$
MediumSolve

Identify the incorrect statement among the following:

A.There is a decrease in the radii of the atoms or ions as one proceeds from $\text{La}$ to $\text{Lu}$.
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.
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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.$CrO_4^{2-}$
B.$Cr_2(SO_3)_3$
C.$CrSO_4$
D.$Cr_2(SO_4)_3$
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Which of the following ions will exhibit colour in aqueous solutions?

A.$La^{3+} (Z=57)$
B.$Ti^{3+} (Z=22)$
C.$Lu^{3+} (Z=71)$
D.$Sc^{3+} (Z=21)$
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