iCON Education - d and f Block Elements

2017 Q201 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

In the following reactions, ZnO is respectively acting as a/an :

(a) ZnO + Na₂O $\to$ Na₂ZnO₂

(b) ZnO + CO₂ $\to$ ZnCO₃

A.

base and base

B.

acid and acid

C.

acid and base

D.

base and acid

2016 Q202 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

The transition metal ions responsible for color in ruby and emerald are, respectively :

A.

Cr³⁺ and Co³⁺

B.

Co³⁺ and Cr³⁺

C.

Co³⁺ and Co³⁺

D.

Cr³⁺ and Cr³⁺

2016 Q203 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Which one of the following species is stable in aqueous solution?

A.

Cr²⁺

B.

Cu⁺

C.

MnO$_4^{3 - }$

D.

MnO$_4^{2 - }$

2016 Q204 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Which of the following compounds is metallic and ferromagnetic ?

A.

CrO₂

B.

VO₂

C.

MnO₂

D.

TiO₂

2016 Q205 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

The reaction of zinc with dilute and concentrated nitric acid, respectively, produces :

A.

NO₂ and NO

B.

NO and N₂O

C.

NO₂ and N₂O

D.

N₂O and NO₂

2015 Q206 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

The colour of KMnO₄ is due to :

A.

d – d transition

B.

L $\to$ M charge transfer transition

C.

$\sigma$ – $\sigma$* transition

D.

M $\to$ L charge transfer transition

2015 Q207 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Match the catalysts to the correct processes :

	Catalyst		Process
(A)	TiCl₃	(i)	Wacker process
(B)	PdCl₂	(ii)	Ziegler - Natta polymerization
(C)	CuCl₂	(iii)	Contact process
(D)	V₂O₅	(iv)	Deacon's process

A.

$\left( A \right) - \left( {ii} \right),\,\,\left( B \right) - \left( {iii} \right),\,\,\left( C \right) - \left( {iv} \right),\,\,\left( D \right) - \left( i \right)$

B.

$\left( A \right) - \left( {iii} \right),\,\,\left( B \right) - \left( i \right),\,\,\left( C \right) - \left( {ii} \right),\,\,\left( D \right) - \left( {iv} \right)$

C.

$\left( A \right) - \left( {iii} \right),\,\,\left( B \right) - \left( {ii} \right),\,\,\left( C \right) - \left( {iv} \right),\,\,\left( D \right) - \left( i \right)$

D.

$\left( A \right) - \left( {ii} \right),\,\,\left( B \right) - \left( i \right),\,\,\left( C \right) - \left( {iv} \right),\,\,\left( D \right) - \left( {iii} \right)$

2014 Q208 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Which series of reactions correctly represents chemical relations related to iron and its compound?

A.

Fe $\buildrel {dil.\,{H_2}S{O_4}} \over \longrightarrow $ FeSO₄ $\buildrel {{H_2}S{O_4},{O_2}} \over \longrightarrow $ Fe₂(SO₄)₃ $\buildrel {heat} \over \longrightarrow $ Fe

B.

Fe $\buildrel {{O_2} \, {, heat}} \over \longrightarrow $ FeO $\buildrel {dil.\,{H_2}S{O_4}} \over \longrightarrow $ FeSO₄ $\buildrel {heat} \over \longrightarrow $ Fe

C.

Fe $\buildrel {{Cl_2} \, {, heat}} \over \longrightarrow $ FeCl₃ $\buildrel {heat, \, air} \over \longrightarrow $ FeCl₂ $\buildrel {Zn} \over \longrightarrow $ Fe

D.

Fe $\buildrel {{O_2},\,heat} \over \longrightarrow $ Fe₃O₄ $\buildrel {CO,\,{{600}^o}C} \over \longrightarrow $ FeO $\buildrel {CO,\,{{700}^o}C} \over \longrightarrow $ Fe

2013 Q209 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest $E_{{M^{3 + }}/{M^{2 + }}}^0$ value?

A.

Mn (Z = 25)

B.

Fe (Z = 26)

C.

Co (Z = 27)

D.

Cr (Z = 24)

2013 Q210 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Which of the following arrangements does not represent the correct order of the property stated against it?

A.

Ni²⁺ < Co²⁺ < Fe²⁺ < Mn²⁺ : ionic size

B.

Co³⁺ < Fe³⁺ < Cr³⁺ < Sc³⁺ : stability in aqueous solution

C.

Sc < Ti < Cr < Mn : number of oxidation states

D.

V²⁺ < Cr²⁺ < Mn²⁺ < Fe²⁺ : paramagnetic behaviour

Correct Answer: D

Explanation:

(1)

V = 3d³4s²	V²⁺ = 3d³	= 3 unpaired electron
Cr = 3d⁵4s¹	Cr²⁺ = 3d⁴	= 4 unpaired electron
Mn = 3d⁵4s²	Mn²⁺ = 3d⁵	= 5 unpaired electron
Fe = 3d⁶4s²	Fe²⁺ = 3d⁶	= 4 unpaired electron

hence the correct order of paramagnetic behaviour

${V^{2 + }} < Cr{}^{2 + } = F{e^{2 + }} < M{n^{2 + }}$

(2) $\,\,\,\,$

For the same oxidation state, the-ionic radii generally $dc$-creases as the atomic number increases in a particular transition series.

Hence the order is

$M{n^{ + + }} > F{e^{ + + }} > C{o^{ + + }} > N{i^{ + + }}$

(3)

In solution, the stability of the compounds depends upon electrode potentials, $SEP$ of the transitions metal ions are given as

$C{o^{3 + }}/Co = + 1.97,\,\,\,F{e^{3 + }}/Fe = + 0.77;$

$C{r^{3 + }}/C{r^{2 + }} = - 0.41,\,\,S{c^{3 + }}$ is highly stable as it does not show $+2$ $O.$ $S.$

(4)

$Sc - \left( { + 2} \right),\left( { + 3} \right)$

$Ti - \left( { + 2} \right),\left( { + 3} \right),\left( { + 4} \right)$

$Cr - \left( { + 1} \right),\left( { + 2} \right),\left( { + 3} \right),\left( { + 4} \right),\left( { + 5} \right),\left( { + 6} \right)$

$Mn - \left( { + 2} \right),\left( { + 3} \right),\left( { + 4} \right),\left( { + 5} \right),\left( { + 6} \right),\left( { + 7} \right)$

$i.e.\,Sc < Ti < Cr = Mn$

${E_a} = 53598.6J/mol$

$ = 53.6\,kJ/mol.$

2012 Q211 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Iron exhibits + 2 and +3 oxidation states. Which of the following statements about iron is incorrect?

A.

Ferrous oxide is more basic in nature than the ferric oxide

B.

Ferrous compounds are relatively more ionic than the corresponding ferric compounds

C.

Ferrous compounds are less volatile than the corresponding ferric compounds

D.

Ferrous compounds are more easily hydrolysed than the corresponding ferric compounds.

2011 Q212 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

In context of the lanthanoids, which of the following statements is not correct?

A.

All the members exhibit +3 oxidation state

B.

Because of similar properties the separation of lanthanoids is not easy.

C.

Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series.

D.

There is a gradual decrease in the radii of the members with increasing atomic number in the series.

2011 Q213 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

The outer electron configuration of $Gd$ (Atomic No. $64$) is :

A.

$4{f^3}\,5{d^5}\,6{s^2}$

B.

$4{f^8}\,5{d^0}\,6{s^2}$

C.

$4{f^4}\,5{d^4}\,6{s^2}$

D.

$4{f^7}\,5{d^1}\,6{s^2}$

2009 Q214 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

In context with the transition elements, which of the following statements is incorrect ?

A.

In addition to the normal oxidation states, the zero oxidation state is also shown by these elements in complexes.

B.

In the highest oxidation states, the transition metal show basic character and form cationic complexes.

C.

In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and 3d electrons are used for bonding

D.

Once the d⁵ configuration is exceeded, the tendency to involve all the 3d electrons in bonding decreases.

2009 Q215 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?

A.

Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character.

B.

The ionic sizes of Ln (III) decrease in general with increasing atomic number.

C.

Ln (III) compounds are generally colourless

D.

Ln (III) hydroxides are mainly basic in character.

2008 Q216 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Amount of oxalic acid present in a solution can be determined by its titration with $KMn{O_4}$ solution in the presence of ${H_2}S{O_4}.$ The titration gives unsatisfactory result when carried out in the presence of $HCl,$ because $HCl$ :

A.

gets oxidised by oxalic acid to chlorine

B.

furnishes ${H^ + }$ ions in addition to those from oxalic acid

C.

reduces permanganate to $M{n^{2 + }}$

D.

oxaidises oxalic acid to carbon doxide and water

2008 Q217 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being :

A.

4f orbitals more diffused than the 5f orbitals

B.

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

C.

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

D.

more reactive nature of the actinoids than the lanthanoids

2007 Q218 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because :

A.

the 5f orbitals are more buried than the 4f orbitals

B.

there is a similarity between 4f and 5f orbitals in their angular part of the wave function

C.

the actinoids are more reactive than the lanthanoids

D.

the 5f orbitals extend further from the nucleus than the 4f orbitals

2007 Q219 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Identify the incorrect statement among the following :

A.

d-Block elements show irregular and erratic chemical properties among themselves

B.

La and Lu have partially filled d orbitals and no other partially filled orbitals

C.

The chemistry of various lanthanoids is very similar

D.

4f and 5f orbitals are equally shielded

2006 Q220 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Lanthanoid contraction is caused due to :

A.

the appreciable shielding on outer electrons by 4f electrons from the nuclear charge

B.

the appreciable shielding on outer electrons by 5d electrons from the nuclear charge

C.

the same effective nuclear charge from Ce to Lu

D.

the imperfect shielding on outer electrons by 4f electrons from the nuclear charge

2006 Q221 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

A metal, $M$ forms chlorides in its $+2$ and $+4$ oxidation states. Which of the following statements about these chlorides is correct?

A.

$MC{l_2}$ is more ionic than $MC{l_4}$

B.

$MC{l_2}$ is more easily hydrolysed than $MC{l_4}$

C.

$MC{l_2}$ is more volatile than $MC{l_4}$

D.

$MC{l_2}$ is more soluble in anhydrous ethanol than $MC{l_4}$.

2006 Q222 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

The “spin-only” magnetic moment [in units of Bohr magneton, (µ_B)] of Ni²⁺ in aqueous solution would be : (Atomic number of Ni = 28)

A.

2.84

B.

4.90

C.

0

D.

1.73

2005 Q223 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

On heating mixture of $C{u_2}O$ and $C{u_2}S$ will give :

A.

$C{u_2}S{O_3}$

B.

$CuO + CuS$

C.

$Cu + S{O_3}$

D.

$Cu + S{O_2}$

2005 Q224 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Calomel $\left( {H{g_2}C{l_2}} \right)$ on reaction with ammonium hydroxide gives :

A.

$HgO$

B.

$H{g_2}O$

C.

$N{H_2} - Hg - Hg - Cl$

D.

$HgN{H_2}Cl$

2005 Q225 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

The oxidation state of chromium in the final product formed the reaction between $K{\rm I}$ and acidified potassium dichromate solution is :

A.

$+3$

B.

$+2$

C.

$+6$

D.

$+4$

2005 Q226 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Which of the following factors may be regarded as the main cause of lanthanide contraction?

A.

Poor shielding of one of 4f electron by another in the subshell

B.

Effective shielding of one of 4f electrons by another in the subshell

C.

Poorer shielding of 5d electrons by 4f electrons

D.

Greater shielding of 5d electrons by 4f electrons

2005 Q227 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

The lanthanide contraction is responsible for the fact that :

A.

Zr and Y have about the same radius

B.

Zr and Nb have similar oxidation state

C.

Zr and Hf have about the same radius

D.

Zr and Zn have the same oxidation

2004 Q228 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?

A.

$\left( {n - 1} \right){d^3}n{s^2}$

B.

$\left( {n - 1} \right){d^5}n{s^1}$

C.

$\left( {n - 1} \right){d^8}n{s^2}$

D.

$\left( {n - 1} \right){d^5}n{s^2}$

2004 Q229 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?

A.

The common oxidation states of cerium are +3 and +4

B.

Cerium (IV) acts as an oxidizing agent

C.

The +4 oxidation state of cerium is not known in solutions

D.

The +3 oxidation state of cerium is more stable than the +4 oxidation state

2004 Q230 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Excess of KI reacts with CuSO₄ solution and then Na₂S₂O₃ solution is added to it. Which of the statements is incorrect for this reaction?

A.

Cu₂I₂ is reduced

B.

Evolved I₂ is reduced

C.

Na₂S₂O₃ is oxidized

D.

CuI₂ is formed

2003 Q231 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?

A.

$Cr_2O^{2-}_7$ and H₂O are formed

B.

$CrO^{2-}_4$ is reduced to +3 state of Cr

C.

$CrO^{2-}_4$ is oxidized to +7 state of Cr

D.

Cr³⁺ and $Cr_2O^{2-}_7$ are formed

2003 Q232 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

The number of d-electrons retained in Fe²⁺ (At no of Fe = 26) ion is :

A.

4

B.

5

C.

6

D.

3

2003 Q233 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

A red solid is insolvable in water. However it becomes soluble if some $K{\rm I}$ is added to water. Heating the red solid in a test tube results in liberation of some violet colored fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is :

A.

$Hg{{\rm I}_2}$

B.

$HgO$

C.

$P{b_3}{O_4}$

D.

${\left( {N{H_4}} \right)_2}C{r_2}{O_7}$

2003 Q234 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Which one of the following statements is correct?

A.

From a mixed precipitate of AgCl and AgI, ammonia solution dissolves only AgCl

B.

Ferric ions give a deep green precipitate on adding potassium ferrocyanide solution

C.

On boiling a solution having K⁺, Ca²⁺ and HCO₃ ions we get a precipitate of K₂Ca(CO₃)₂.

D.

Manganese salts give a violet borax bead test in the reducing flame

2003 Q235 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Which one of the following nitrates will leave behind a metal on strong heating?

A.

Copper nitrate

B.

Manganese nitrate

C.

Silver nitrate

D.

Ferric nitrate

2003 Q236 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

The atomic numbers of vanadium (V), Chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23, 24, 25 and 26. Which one of these may be expected to have the highest second ionization enthalpy?

A.

Cr

B.

Mn

C.

Fe

D.

V

2003 Q237 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which does not solidify before glass. The metal used can be :

A.

tin

B.

sodium

C.

magnesium

D.

mercury

2003 Q238 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

The radius of La³⁺ (Atomic number of La = 57) is 1.06 Å. Which one of the following given values will be closest to the radius of Lu³⁺ (Atomic number of Lu = 71) ?

A.

1.60 Å

B.

1.40 Å

C.

0.85 Å

D.

1.60 Å

2002 Q239 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

How do we differentiate between Fe³⁺ and Cr³⁺ in group III?

A.

by taking excess of NH₄OH solution

B.

by increasing $NH_4^+$ ion concentration

C.

by decreasing OH^- ion concentration

D.

both (b) and (c)

2002 Q240 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Most common oxidation states of Ce (cerium) are :

A.

+3, +4

B.

+2, +3

C.

+2, +4

D.

+3, +5

2002 Q241 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

When KMnO₄ acts as an oxidising agent and ultimately forms [MnO₄]^-2, MnO₂, Mn₂O₃, Mn⁺² then the number of electrons transferred in each case respectively is :

A.

4, 3, 1, 5

B.

1, 5, 3, 7

C.

1, 3, 4, 5

D.

3, 5, 7, 1

2002 Q242 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 14 Mar 2026

Which of the following ions has the maximum magnetic moment?

A.

Mn²⁺

B.

Fe²⁺

C.

Ti²⁺

D.

Cr²⁺

Chemistry Chapters

d and f Block Elements

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