Question 1: Palette 1/82

NEET 2026 MCQ

$ \text { Match List I with List II : } $

List I (Transition metal/compound/ complex)		List II (Catalytic Role)
A.	$\mathrm{V}_2 \mathrm{O}_5$	I.	Preparation of ammonia from $\mathrm{N}_2 / \mathrm{H}_2$ mixture
B.	Fe	II.	Polymerisation of alkynes
C.	$\mathrm{PdCl}_2$	III.	Preparation of $\mathrm{H}_2 \mathrm{SO}_4$ and $\mathrm{SO}_2$
D.	Ni complex	IV.	Oxidation of ethyne to ethanal

Choose the correct answer from the options given below.

A

A-III, B-IV, C-I, D-II

B

A-IV, B-I, C-III, D-II

C

A-II, B-I, C-IV, D-III

D

A-III, B-I, C-IV, D-II

Question 2: Palette 2/82

NEET 2026 MCQ

Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because:

A

After losing one more electron, it acquires $4 f^{14}$ electronic configuration.

B

Its nearest inert gas is Radon.

C

Its atomic number is 61 .

D

After losing one more electron, it acquires $4 f^0$ electronic configuration.

Question 3: Palette 3/82

NEET 2026 MCQ

The calculated 'spin-only' magnetic moment $\mathrm{Ti}^{2+}\left(3 \mathrm{~d}^2\right)$ is :

A

5.92 BM

B

3.87 BM

C

2.84 BM

D

4.90 BM

Question 4: Palette 4/82

NEET 2026 MCQ

The lanthanide ion having four unpaired electrons is (Given : Atomic numbers of $\mathrm{Ce}=58, \mathrm{Nd}=60, \mathrm{~Tb}=65$ and $\mathrm{Ho}=67$ )

A

$\mathrm{Ho}^{3+}$

B

$\mathrm{Nd}^{3+}$

C

$\mathrm{Ce}^{3+}$

D

$\mathrm{Tb}^{3+}$

Question 5: Palette 5/82

NEET 2026 MCQ

The green paramagnetic species formed by heating $\mathrm{KMnO}_4$ at 513 K is

A

$\mathrm{KO}_2$

B

$\mathrm{K}_2 \mathrm{MnO}_4$

C

$\mathrm{Mn}_3 \mathrm{O}_4$

D

MnO

Question 6: Palette 6/82

NEET 2026 MCQ

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

Assertion A: Generally, $3 d$ transition metals have high melting points.

Reason R: Involvement of $3 d$-electrons in addition to $4 s$-electrons in the interatomic metallic bonding.

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

A

$\mathbf{A}$ is not correct but $\mathbf{R}$ is correct

B

Both $\mathbf{A}$ and $\mathbf{R}$ are correct and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$

C

Both $\mathbf{A}$ and $\mathbf{R}$ are correct and $\mathbf{R}$ is NOT the correct explanation of $\mathbf{A}$

D

$\mathbf{A}$ is correct but $\mathbf{R}$ is not correct.

Question 7: Palette 7/82

NEET 2025 MCQ

Match List - I with List - II.

	List - I		List - II
A	Haber process	I	Fe catalyst
B	Wacker oxidation	II	$\mathrm{PdCl}_2$
C	Wilkinson catalyst	III	$\left[\left(\mathrm{PPh}_3\right)_3 \mathrm{RhCl}\right]$
D	Ziegler catalyst	IV	$\mathrm{TiCl}_4$ with $\mathrm{Al}\left(\mathrm{CH}_3\right)_3$

Choose the correct answer from the options given below :

A

A-I, B-II, C-III, D-IV

B

A-I, B-IV, C-III, D-II

C

A-I, B-II, C-IV, D-III

D

A-II, B-III, C-I, D-IV

Question 8: Palette 8/82

NEET 2025 MCQ

Given below are two statements :

Statement I: Ferromagnetism is considered as an extreme form of paramagnetism.

Statement II : The number of unpaired electrons in a $\mathrm{Cr}^{2+}$ ion $(\mathrm{Z}=24)$ is the same as that of a $\mathrm{Nd}^{3+}$ ion $(\mathrm{Z}=60)$.

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

A

Statement I is true but Statement II is false

B

Statement I is false but Statement II is true

C

Both Statement I and Statement II are true

D

Both Statement I and Statement II are false

Question 9: Palette 9/82

NEET 2024 MCQ

Baeyer's reagent is :

A

Acidic potassium permanganate solution

B

Acidic potassium dichromate solution

C

Cold, dilute, aqueous solution of potassium permanganate

D

Hot, concentrated solution of potassium permanganate

Question 10: Palette 10/82

NEET 2024 MCQ

Which of the following pairs of ions will have same spin only magnetic moment values within the pair?

A. $\mathrm{Zn}^{2+}, \mathrm{Ti}^{2+}$

B. $\mathrm{Cr}^{2+}, \mathrm{Fe}^{2+}$

C. $\mathrm{Ti}^{3+}, \mathrm{Cu}^{2+}$

D. $\mathrm{V}^{2+}, \mathrm{Cu}^{+}$

Choose the correct answer from the options given below :

A

C and D only

B

A and D only

C

A and B only

D

B and C only

Question 11: Palette 11/82

NEET 2024 MCQ

Which of the following set of ions act as oxidising agents?

A

$\mathrm{Ce}^{4+}$ and $\mathrm{Tb}^{4+}$

B

$\mathrm{La}^{3+}$ and $\mathrm{Lu}^{3+}$

C

$\mathrm{Eu}^{2+}$ and $\mathrm{Yb}^{2+}$

D

$\mathrm{Eu}^{2+}$ and $\mathrm{Tb}^{4+}$

Question 12: Palette 12/82

NEET 2024 MCQ

The UV-visible absorption bands in the spectra of lanthanoid ions are 'X', probably because of the excitation of electrons involving 'Y'. The 'X' and 'Y', respectively, are : Narrow and d and f orbitals

A

Broad and f orbitals

B

Narrow and f orbitals

C

Broad and d and f orbitals

D

Narrow and d and f orbitals

Question 13: Palette 13/82

NEET 2024 MCQ

Match List I with List II:

	List - I (Block/group in periodic table)		List - II (Element)
(A)	Lanthanoid	(I)	Ce
(B)	d-block element	(II)	As
(C)	p-block element	(III)	Cs
(D)	s-block element	(IV)	Mn

Choose the correct answer from the options given below:

A

A-I, B-II, C-IV, D-III

B

A-I, B-IV, C-III, D-II

C

A-I, B-IV, C-II, D-III

D

A-IV, B-I, C-II, D-III

Question 14: Palette 14/82

NEET 2024 MCQ

Identify the incorrect statement.

A

$\mathrm{PEt}_3$ and $\mathrm{AsPh}_3$ as ligands can form $\mathrm{d} \pi-\mathrm{d} \pi$ bond with transition metals

B

The $\mathrm{N}-\mathrm{N}$ single bond is as strong as the $\mathrm{P}-\mathrm{P}$ single bond

C

Nitrogen has unique ability to form $p \pi-p \pi$ multiple bonds with nitrogen, carbon and oxygen

D

Nitrogen cannot form $\mathrm{d} \pi-\mathrm{p} \pi$ bond as other heavier elements of its group

Question 15: Palette 15/82

NEET 2024 MCQ

'Spin only' magnetic moment is same for which of the following ions?

A. $\mathrm{Ti}^{3+}$

B. $\mathrm{Cr}^{2+}$

C. $\mathrm{Mn}^{2+}$

D. $\mathrm{Fe}^{2+}$

E. $\mathrm{Sc}^{3+}$

Choose the most appropriate answer from the options given below.

A

B and D only

B

A and E only

C

B and C only

D

A and D only

Question 16: Palette 16/82

NEET 2024 MCQ

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

A

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

B

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

C

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

D

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

Question 17: Palette 17/82

NEET 2024 MCQ

The pair of lanthanoid ions which are diamagnetic is

A

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

B

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

C

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

D

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

Question 18: Palette 18/82

NEET 2023 MCQ

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

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

B

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

C

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

D

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

Question 19: Palette 19/82

NEET 2023 MCQ

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

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

B

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

C

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

D

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

Question 20: Palette 20/82

NEET 2023 MCQ

The stability of $\mathrm{Cu}^{2+}$ is more than $\mathrm{Cu}^{+}$ salts in aqueous solution due to -

A

enthalpy of atomization.

B

hydration energy.

C

second ionisation enthalpy.

D

first ionisation enthalpy.

Question 21: Palette 21/82

NEET 2023 MCQ

Which of the following statements are INCORRECT?

A. All the transition metals except scandium form MO oxides which are ionic.

B. The highest oxidation number corresponding to the group number in transition metal oxides is attained in $\mathrm{Sc}_{2} \mathrm{O}_{3}$ to $\mathrm{Mn}_{2} \mathrm{O}_{7}$.

C. Basic character increases from $\mathrm{V}_{2} \mathrm{O}_{3}$ to $\mathrm{V}_{2} \mathrm{O}_{4}$ to $\mathrm{V}_{2} \mathrm{O}_{5}$.

D. $\mathrm{V}_{2} \mathrm{O}_{4}$ dissolves in acids to give $\mathrm{VO}_{4}^{3-}$ salts.

E. $\mathrm{CrO}$ is basic but $\mathrm{Cr}_{2} \mathrm{O}_{3}$ is amphoteric.

Choose the correct answer from the options given below:

A

B and D only

B

C and D only

C

B and C only

D

A and E only

Question 22: Palette 22/82

NEET 2022 MCQ

Given below are two statements :

Statement I : Cr²⁺ is oxidising and Mn³⁺ is reducing in nature.

Statement II : Sc³⁺ compounds are repelled by the applied magnetic field.

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

A

Statement I is incorrect but Statement II is correct

B

Both Statement I and Statement II are correct

C

Both Statement I and Statement II are incorrect

D

Statement I is correct but Statement II is incorrect

Question 23: Palette 23/82

NEET 2021 MCQ

The incorrect statement among the following is :

A

Actinoids are highly reactive metals, especially when finely divided.

B

Actinoid contraction is greater for element to element than lanthanoid contraction.

C

Most of the trivalent Lanthanoid ions are colorless in the solid state.

D

Lanthanoids are good conductors of heat and electricity.

Question 24: Palette 24/82

NEET 2021 MCQ

Which of the following reactions is the metal displacement reaction? Choose the right option.

A

$2Pb{(N{O_3})_2} \to 2PbO + 4N{O_2} + {O_2} \uparrow $

B

$2KCl{O_3}\buildrel \Delta \over \longrightarrow 2KCl + 3{O_2}$

C

$C{r_2}{O_3} + 2Al\buildrel \Delta \over \longrightarrow A{l_2}{O_3} + 2Cr$

D

$Fe + 2HCl \to FeC{l_2} + {H_2} \uparrow $

Question 25: Palette 25/82

NEET 2021 MCQ

Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of :

A

Having similar chemical properties

B

Belonging to same group

C

Diagonal relationship

D

Lanthanoid contraction

Question 26: Palette 26/82

NEET 2020 MCQ

Identify the incorrect statement.

A

The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.

B

Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.

C

The oxidation states of chromium in CrO₄^2- and Cr₂O₇^2- are not the same.

D

Cr²⁺ (d⁴) is a stronger reducing agent than Fe²⁺ (d⁶) in water.

Question 27: Palette 27/82

NEET 2018 MCQ

Which one of the following ions exhibits d-d transition and paramagnetism as well?

A

CrO₄^2-

B

Cr₂O₇^2–

C

MnO₄^-

D

MnO₄^2-

Question 28: Palette 28/82

NEET 2018 MCQ

Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code :

Column - I	Column - II
A. Co3+	(i) $\sqrt 8 $ B.M.
B. Cr3+	(ii) $\sqrt {35} $ B.M.
C. Fe3+	(iii) $\sqrt 3 $ B.M.
D. Ni2+	(iv) $\sqrt {24} $ B.M.
	(v) $\sqrt {15} $ B.M.

A

A	B	C	D
(iv)	(v)	(ii)	(i)

B

A	B	C	D
(i)	(ii)	(iii)	(iv)

C

A	B	C	D
(iv)	(i)	(ii)	(iii)

D

A	B	C	D
(iii)	(v)	(i)	(ii)

Question 29: Palette 29/82

NEET 2017 MCQ

Name the gas that can readily decolourise acidified KMnO₄ solution.

A

SO₂

B

NO₂

C

P₂O₅

D

CO₂

Question 30: Palette 30/82

NEET 2017 MCQ

HgCl₂ and I₂ both when dissolved in water containing I^$-$ ions, the pair of species formed is

A

HgI₂, I^$-$

B

HgI$_4^{2 - }$, I$_3^{ - }$

C

Hg₂I₂, I^$-$

D

HgI₂, I$_3^{ - }$

Question 31: Palette 31/82

NEET 2017 MCQ

The reason for greater range of oxidation states in actinoids is attributed to

A

actinoid contraction

B

5$f$, 6d and 7s levels having comparable energies

C

4$f$ and 5d levels being close in energies

D

the radioactive nature of actinoids.

Question 32: Palette 32/82

NEET 2016 MCQ

Which one of the following statements related to lanthanoids is incorrect?

A

Europium shows + 2 oxidation state.

B

The basicity decreases as the ionic radius decreases from Pr to Lu.

C

All the lanthanons are much more reactive than aluminium.

D

Ce(+4) solutions are widely used as oxidizing agent in volumetric analysis.

Question 33: Palette 33/82

NEET 2016 MCQ

Which one of the following statements is correct when SO₂ is passed through acidified K₂Cr₂O₇ solution?

A

SO₂ is reduced.

B

Green Cr₂(SO₄)₃ is formed.

C

The solution turns blue.

D

The solution is decolourised.

Question 34: Palette 34/82

NEET 2016 MCQ

The electronic configuration of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No.65) are

A

[Xe]4f⁶5d¹6s²,
[Xe]4f⁷5d¹6s² and [Xe]4f⁸5d¹6s²

B

[Xe]4f⁷ 6s², [Xe]4f⁷ 5d¹ 6s² and [Xe]4f⁹ 6s²

C

[Xe]4f⁷ 6s², [Xe]4f⁸ 6s² and [Xe]4f⁸ 5d¹ 6s²

D

[Xe]4f⁶ 5d¹ 6s², [Xe]4f⁷ 5d¹ 6s² and [Xe]4f⁹ 6s²

Question 35: Palette 35/82

NEET 2015 MCQ

Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

A

[Xe]4f⁹5s¹

B

[Xe]4f⁷5d¹6s²

C

[Xe]4f⁶5d²6s²

D

[Xe]4f⁸6d²

Question 36: Palette 36/82

NEET 2015 MCQ

Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified KMnO₄ for complete oxidation?

A

FeSO₃

B

FeC₂O₄

C

Fe(NO₂)₂

D

FeSO₄

Question 37: Palette 37/82

NEET 2015 MCQ

Which of the following processes does not involve oxidation of iron?

A

Formation of Fe(CO)₅ from Fe.

B

Liberation of H₂ from steam by iron at high temperature.

C

Rusting of iron sheets.

D

Decolourisation of blue CuSO₄ solution by iron.

Question 38: Palette 38/82

NEET 2015 MCQ

Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers)

A

Zr(40) and Hf(72)

B

Zr(40) and Ta(73)

C

Ti(22) and Zr(40)

D

Zr(40) and Nb(41)

Question 39: Palette 39/82

NEET 2015 MCQ

Magnetic moment 2.84 B.M. is given by (At. nos. Ni = 28, Ti = 22, Cr = 24, Co = 27)

A

Cr²⁺

B

Co²⁺

C

Ni²⁺

D

Ti³⁺

Question 40: Palette 40/82

NEET 2014 MCQ

Magnetic moment 2.83 BM is given by which of the following ions?
(At. nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)

A

Ti³⁺

B

Ni²⁺

C

Cr³⁺

D

Mn²⁺

Question 41: Palette 41/82

NEET 2014 MCQ

The reaction of aqueous KMnO₄ with H₂O₂ in acidic conditions gives

A

Mn⁴⁺ and O₂

B

Mn²⁺ and O₂

C

Mn²⁺ and O₃

D

Mn⁴⁺ and MnO₂

Question 42: Palette 42/82

NEET 2014 MCQ

Reason of lanthanoid contraction is

A

negligible screening effect of 'f'- orbitals

B

increasing nuclear charge

C

decreasing nuclear charge

D

decreasing screening effect.

Question 43: Palette 43/82

NEET 2013 MCQ

Sc (Z = 21) is a transition element but Zn (Z = 30) is not because

A

both Sc³⁺ and Zn²⁺ ions are colourless and form white compounds.

B

in case of Sc, 3d orbitals are partially filled but in Zn these are filled.

C

last electron is assumed to be added to 4s level in case of Zn.

D

both Sc and Zn do not exhibit variable oxidation states.

Question 44: Palette 44/82

NEET 2013 MCQ

Which of the following statements about the interstitial compounds is incorrect?

A

They are much harder than the pure metal.

B

They have higher melting points than the pure metal.

C

The retain metallic conductivity.

D

They are chemically reactive.

Question 45: Palette 45/82

NEET 2013 MCQ

Which of the following lanthanoid ions is diamagnetic?
(At. nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)

A

Eu²⁺

B

Yb²⁺

C

Ce²⁺

D

Sm²⁺

Question 46: Palette 46/82

NEET 2012 MCQ

Which of the following exhibits only + 3 oxidation state?

A

U

B

Th

C

Ac

D

Pa

Question 47: Palette 47/82

NEET 2012 MCQ

Which one of the following does not correctly represent the correct order of the property indicated against it?

A

Ti < V < Cr < Mn; increasing number of oxidation states

B

Ti³⁺ < V³⁺ < Cr³⁺ < Mn³⁺ : increasing magnetic moment

C

Ti < V < Cr < Mn : increasing melting points

D

Ti < V < Mn < Cr : increasing 2^nd ionization enthalpy

Question 48: Palette 48/82

NEET 2012 MCQ

Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential $\left( {E_{{M^{2 + }}/M}^o} \right)$ value has a positive sign?

A

Co (Z = 27)

B

Ni (Z = 28)

C

Cu (Z = 29)

D

Fe (Z = 26)

Question 49: Palette 49/82

NEET 2012 MCQ

The catalytic activity of transition metals and their compounds is ascribed mainly to

A

their magnetic behaviour

B

their unfilled $d$-orbitals

C

their ability to adopt variable oxidation states

D

their chemical reactivity

Question 50: Palette 50/82

NEET 2012 MCQ

Identify the alloy containing a non-metal as a constituent in it.

A

Invar

B

Steel

C

Bell metal

D

Bronze

Question 51: Palette 51/82

NEET 2012 MCQ

Which of the statements is not true?

A

On passing H₂S through acidified K₂Cr₂O₇ solution, a milky colour is observed.

B

Na₂Cr₂O₇ is preferred over K₂Cr₂O₇ in volumetric analysis.

C

K₂Cr₂O₇ solution in acidic medium is orange.

D

K₂Cr₂O₇ solution becomes yellow increasing the pH beyond 7.

Question 52: Palette 52/82

NEET 2011 MCQ

Acidified K₂Cr₂O₇ solution turns green when Na₂SO₃ is added to it. This is due to the formation of

A

Cr₂(SO₄)₃

B

CrO$_4^{2 - }$

C

Cr₂(SO₃)₃

D

CrSO₄

Question 53: Palette 53/82

NEET 2011 MCQ

For the four successive transition elements (Cr, Mn, Fe and Co), the stability of + 2 oxidation state will be there in which of the following order?
(At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

A

Mn > Fe > Cr > Co

B

Fe > Mn > Co > Cr

C

Co > Mn > Fe > Cr

D

Cr > Mn > Co > Fe

Question 54: Palette 54/82

NEET 2010 MCQ

Match List I (substances) with List II (processes) employed in the manufacture of the substances and select the correct option.

Column ${\rm I}$ (Substances)			Column ${\rm I}$${\rm I}$ (Processes)
(A)	Sulphuric acid		(i)	Haber's process
(B)	Steel		(ii)	Bessemer's process
(C)	Sodium hydroxide		(iii)	Leblanc process
(D)	Ammonia		(iv)	Contact process

A

(A) $ \to $ (i);  (B) $ \to $ (iv);  (C) $ \to $ (ii);  (D) $ \to $ (iii)

B

(A) $ \to $ (i);  (B) $ \to $ (ii);  (C) $ \to $ (iii);  (D) $ \to $ (iv)

C

(A) $ \to $ (iv);  (B) $ \to $ (iii);  (C) $ \to $ (ii);  (D) $ \to $ (i)

D

(A) $ \to $ (iv);  (B) $ \to $ (ii);  (C) $ \to $ (iii);  (D) $ \to $ (i)

Question 55: Palette 55/82

NEET 2010 MCQ

Which of the following oxidation states is the most common among the lanthanoids?

A

4

B

2

C

5

D

3

Question 56: Palette 56/82

NEET 2010 MCQ

Which of the following ions has electronic configuration [Ar]3d⁶?
(At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)

A

Ni³⁺

B

Mn³⁺

C

Fe³⁺

D

Co³⁺

Question 57: Palette 57/82

NEET 2010 MCQ

Which of the following ions will exhibit colour in aqueous solutions?

A

La³⁺ (Z = 57)

B

Ti³⁺ (Z = 22)

C

Lu³⁺ (Z = 71)

D

Se³⁺ (Z = 21)

Question 58: Palette 58/82

NEET 2010 MCQ

Which of the following pairs has the same size?

A

Fe²⁺, Ni²⁺

B

Zr⁴⁺, Ti⁴⁺

C

Zr⁴⁺, Hf⁴⁺

D

Zn²⁺, Hf⁴⁺

Question 59: Palette 59/82

NEET 2009 MCQ

Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?

A

3d⁵4s¹

B

3d⁵4s²

C

3d²4s²

D

3d³4s²

Question 60: Palette 60/82

NEET 2008 MCQ

The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is

A

Mn > Cr > Ti > V

B

Ti > V > Cr > Mn

C

Cr > Mn > V > Ti

D

V > Mn > Cr > Ti

Question 61: Palette 61/82

NEET 2007 MCQ

Identify the incorrect statement among the following:

A

Lanthanoid contraction is the accumulation of successive shrinkages.

B

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

C

Shielding power of 4$f$ electrons is quite weak.

D

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

Question 62: Palette 62/82

NEET 2007 MCQ

Which one of the following ions is the most stable in aqueous solution?
(At. No. Ti = 22, V = 23, Cr = 24, Mn = 25)

A

V³⁺

B

Ti³⁺

C

Mn³⁺

D

Cr³⁺

Question 63: Palette 63/82

NEET 2006 MCQ

Copper sulphate dissolves in excess of KCN to give

A

Cu(CN)₂

B

CuCN

C

[Cu(CN)₄]^3$-$

D

[Cu(CN)₄]^2$-$

Question 64: Palette 64/82

NEET 2006 MCQ

In which of the following pairs are both the ions coloured in aqueous solution?
(At. no. : Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

A

Ni²⁺, Cu⁺

B

Ni²⁺, Ti³⁺

C

Sc³⁺, Ti³⁺

D

Sc³⁺, Co²⁺.

Question 65: Palette 65/82

NEET 2006 MCQ

More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is

A

more active nature of the actinoids

B

more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals

C

lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals

D

greater metallic character of the lanthanoids than that of the corresponding actinoids.

Question 66: Palette 66/82

NEET 2005 MCQ

The number of moles of KMnO₄ reduced by one mole of KI in alkaline medium is

A

one

B

two

C

five

D

one fifth

Question 67: Palette 67/82

NEET 2005 MCQ

More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is

A

more active nature of the actinoids

B

more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals

C

lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals

D

greater metallic character of the lanthanoids than that of the corresponding actinoids.

Question 68: Palette 68/82

NEET 2005 MCQ

Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?

A

Vanadium (Z = 23)

B

Chromium (Z = 24)

C

Manganese (Z = 25)

D

Iron (Z = 26)

Question 69: Palette 69/82

NEET 2005 MCQ

The aqueous solution containing which one of the following ions will be colourless?
(Atomic number : Sc = 21, Fe = 26, Ti = 22, Mn = 25)

A

Sc³⁺

B

Fe²⁺

C

Ti³⁺

D

Mn²⁺

Question 70: Palette 70/82

NEET 2004 MCQ

lanthanoids are

A

14 elements in the sixth period (atomic no. 90 to 103) that are filling 4f sublevel

B

14 elements in the seventh period (atomic number = 90 to 103) that are filling 5f sublevel

C

14 elements in the sixth period (atomic number = 58 to 71) that are filling the 4f sublevel

D

14 elements in the seventh period (atomic number = 50 to 71) that are filling 4f sublevel.

Question 71: Palette 71/82

NEET 2004 MCQ

Among the following series of transition metal ions, the one where all metal ions have 3d² electronic configuration is
[At. Nos. Ti = 22, V = 23, Cr = 24, Mn = 25]

A

Ti³⁺, V²⁺, Cr³⁺, Mn⁴⁺

B

Ti⁺, V⁴⁺, Cr⁶⁺, Mn⁷⁺

C

Ti⁴⁺, V³⁺, Cr²⁺, Mn³⁺

D

Ti²⁺, V³⁺, Cr⁴⁺, Mn⁵⁺

Question 72: Palette 72/82

NEET 2003 MCQ

Which one of the following characteristics of the transition metals is associated with their catalytic activity?

A

High enthalpy of atomization

B

Paramagnetic behaviour

C

Colour of hydrated ions

D

Variable oxidation states

Question 73: Palette 73/82

NEET 2003 MCQ

The correct order of ionic radii of Y³⁺, La³⁺, Eu³⁺ and Lu³⁺ is
(Atomic nos. Y = 39, La = 57, Eu = 63, Lu = 71)

A

Y³⁺ < La³⁺ < Eu³⁺ < Lu³⁺

B

Y³⁺ < Lu³⁺ < Eu³⁺ < La³⁺

C

Lu³⁺ < Eu³⁺ < La³⁺ < Y³⁺

D

La³⁺ < Eu³⁺ < Lu³⁺ < Y³⁺

Question 74: Palette 74/82

NEET 2003 MCQ

The basic character of the transition metal monoxides follows the order
(Atomic no's. Ti = 22, V = 23, Cr = 24, Fe = 26)

A

VO > CrO > TiO > FeO

B

CrO > VO > FeO > TiO

C

TiO > FeO > VO > CrO

D

TiO > VO > CrO > FeO

Question 75: Palette 75/82

NEET 2002 MCQ

An atom has electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d³ 4s², you will place it in

A

fifth

B

fifteenth

C

second

D

third.

Question 76: Palette 76/82

NEET 2002 MCQ

Zn gives H₂ gas with H₂SO₄ and HCl but not with HNO₃ because

A

Zn act as oxidising agent when react with HNO₃

B

HNO₃ is weaker acid than H₂SO₄ and HCl

C

In electrochemical series Zn is above hydrogen

D

NO$_3^ - $ is reduced in preference to hydronium ion.

Question 77: Palette 77/82

NEET 2002 MCQ

General electronic configuration of lanthanides is

A

$\left( {n - 2} \right){f^{1 - 14}}\,\left( {n - 1} \right){s^2}{p^6}{d^{0 - 1}}\,n{s^2}$

B

$\left( {n - 2} \right){f^{0 - 14}}\,\left( {n - 1} \right){d^{0 - 1}}\,n{s^2}$

C

$\left( {n - 2} \right){f^{0 - 14}}\,\left( {n - 1} \right){d^{10}}\,n{s^2}$

D

$\left( {n - 2} \right){d^{0 - 1}}\left( {n - 1} \right)\,{f^{1 - 14}}\,n{s^2}$

Question 78: Palette 78/82

NEET 2002 MCQ

Which of the following shows maximum number of oxidation states?

A

Cr

B

Fe

C

Mn

D

V

Question 79: Palette 79/82

NEET 2001 MCQ

Which of the following statement is not correct?

A

La(OH)₃ is less basic than Lu(OH)₃.

B

In lanthanide series ionic radius of Lu⁺³ ion decreases.

C

La is actually an element of transition series rather lanthanides.

D

Atomic radius of Zn and Hf are same because of lanthanide contraction.

Question 80: Palette 80/82

NEET 2001 MCQ

The most convenient method to protect the botton of ship made of iron is

A

coating it with red lead oxide

B

white tin plating

C

connecting it with Mg block

D

connecting it with Pb block.

Question 81: Palette 81/82

NEET 2000 MCQ

Which of the following shows maximum number of oxidation states?

A

Cr

B

Fe

C

Mn

D

V

Question 82: Palette 82/82

NEET 2000 MCQ

Which ion is colourless?

A

Cr⁴⁺

B

Se³⁺

C

Ti³⁺

D

V³⁺