d and f Block Elements — JEE Main PYQs

Consider the given chemical reaction :

Product " A " is :

The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is ____.
${\mathrm{Ti}}^{2+},{\mathrm{Cr}}^{2+}$ and ${\mathrm{V}}^{2+}$

The fusion of chromite ore with sodium carbonate in the presence of air leads to the formation of products A and B along with the evolution of ${\mathrm{CO}}_2$. The sum of spin-only magnetic moment values of $A$ and $B$ is ____ B.M. (Nearest integer)
(Given atomic number : …

The number of element from the following that do not belong to lanthanoids is :
$\mathrm{Eu},\mathrm{Cm},\mathrm{Er},\mathrm{Tb},\mathrm{Yb}$ and Lu

The difference in the 'spin-only' magnetic moment values of ${\mathrm{KMnO}}_4$ and the manganese product formed during titration of ${\mathrm{KMnO}}_4$ against oxalic acid in acidic medium is ____ BM. (nearest integer)

Among CrO, Cr₂O₃ and CrO₃, the sum of spin-only magnetic moment values of basic and amphoteric oxides is ______ × 10⁻² BM (nearest integer).
(Given atomic number of Cr is 24)

Arrange the following elements in the increasing order of number of unpaired electrons in it.
(A) Sc
(B) Cr
(C) V
(D) Ti
(E) Mn

Choose the correct answer from the options given below:

Among ${\mathrm{VO}}_2^{+},{\mathrm{MnO}}_4^{-}$ and ${\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}$, the spin-only magnetic moment value of the species with least oxidising ability is ______ BM (Nearest integer).
(Given atomic number $\mathrm{V}=23,\mathrm{Mn}=25,\mathrm{Cr}=24$)

Given below are two statements :

Statement (I) : Fusion of ${\mathrm{MnO}}_2$ with KOH and an oxidising agent gives dark green ${\mathrm{K}}_2{\mathrm{MnO}}_4$.

Statement (II) : Manganate ion on electrolytic oxidation in alkaline medium gives permanganate ion.

In the ligh …

The 'spin only' magnetic moment value of ${\mathrm{MO}}_4{}^{2-}$ is
______ BM. (Where M is a metal having least metallic radii. among $\mathrm{Sc},\mathrm{Ti},\mathrm{V},\mathrm{Cr},\mathrm{Mn}$ and Zn ).
(Given atomic number : …

The electronic configuration of $\mathrm{Cu}(\mathrm{II})$ is $3{\mathrm{d}}^9$ whereas that of $\mathrm{Cu}(\mathrm{I})$ is $3{\mathrm{d}}^{10}$. Which of the following is correct ?

Number of colourless lanthanoid ions among the following is ____.
${\mathrm{Eu}}^{3+},{\mathrm{Lu}}^{3+},{\mathrm{Nd}}^{3+},{\mathrm{La}}^{3+},{\mathrm{Sm}}^{3+}$

Given below are two statements :

Statement I: The higher oxidation states are more stable down the group among transition elements unlike p-block elements.

Statement II : Copper can not liberate hydrogen from weak acids.

In the light of the above statements, choose the correct …

The electronic configuration of Einsteinium is :
(Given atomic number of Einsteinium $=99$ )

A transition metal 'M' among Sc, Ti, V, Cr, Mn and Fe has the highest second ionisation enthalpy. The spin only magnetic moment value of ${\mathrm{M}}^{+}$ion is
____ BM (Near integer)
(Given atomic number …

Which of the following electronic configuration would be associated with the highest magnetic moment?

Consider the following complex ions
$\mathrm{P}={\left[{\mathrm{FeF}}_6\right]}^{3-}$
$\mathrm{Q}={\left[\mathrm{V}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$
$\mathrm{R}={\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$
The correct order of the co …

NaCl reacts with conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$ and ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ to give reddish fumes (B), which react with NaOH to give yellow solution (C). (B) and (C) respectively are ;

The electronic configuration for Neodymium is:
[Atomic Number for Neodymium 60]

The transition metal having highest $3^{\text{rd }}$ ionisation enthalpy is :

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

Assertion (A) : In aqueous solutions ${\mathrm{Cr}}^{2+}$ is reducing while ${\mathrm{Mn}}^{3+}$ is oxidising in nature.

Reason (R) : Extra stability to half filled electr …

Which of the following compounds show colour due to d-d transition?

Given below are two statements:

Statement (I): In the Lanthanoids, the formation of Ce⁺⁴ is favoured by its noble gas configuration.

Statement (II): Ce⁺⁴ is a strong oxidant reverting to the common +3 state.

In the light of the above statements, choose the most appropriate ans …

Choose the correct option having all the elements with d¹⁰ electronic configuration from the following:

In chromyl chloride test for confirmation of Cl⁻ ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and 10% H₂O₂ turns organic layer blue indicating formation of chromium pentoxide. The oxidation state of chromium in that is

${\mathrm{KMnO}}_4$ decomposes on heating at 513 K to form ${\mathrm{O}}_2$ along with

Which of the following acts as a strong reducing agent? (Atomic number : $\mathrm{Ce}=58,\mathrm{Eu}=63$, $\mathrm{Gd}=64,\mathrm{Lu}=71$ )

Which of the following statements are correct about $\mathrm{Zn},\mathrm{Cd}$ and Hg ?
A. They exhibit high enthalpy of atomization as the d-subshell is full.
B. Zn and Cd do not show variable oxidation state while Hg shows +I and +II .
C. Compounds of $\mathrm{Zn},\mathrm{Cd}$ …

Identify correct statements from below:
A. The chromate ion is square planar.
B. Dichromates are generally prepared from chromates.
C. The green manganate ion is diamagnetic.
D. Dark green coloured ${\mathrm{K}}_2{\mathrm{MnO}}_4$ disproportionates in a neutral or acidic mediu …

The 'Spin only' Magnetic moment for ${\left[\mathrm{Ni}{\left({\mathrm{NH}}_3\right)}_6\right]}^{2+}$ is ____ $\times 10^{-1}\mathrm{BM}$.
(given $=$ Atomic number of $\mathrm{Ni}:28$ )

Diamagnetic Lanthanoid ions are:

Match List-I with List-II

List-I (Species):
(A) ${\mathrm{Cr}}^{+2}$
(B) ${\mathrm{Mn}}^{+}$
(C) ${\mathrm{Ni}}^{+2}$
(D) ${\mathrm{V}}^{+}$

List-II (Electronic distribution):
(I) $3d^8$
(II) $3{\mathrm{d}}^{3}4{\mathrm{s}}^1$
(III) $3{\mathrm{d}}^4$
(IV) …

Choose the correct statements from the following
A. ${\mathrm{Mn}}_2{\mathrm{O}}_7$ is an oil at room temperature
B. ${\mathrm{V}}_2{\mathrm{O}}_4$ reacts with acid to give ${\mathrm{VO}}_2^{2+}$
C. CrO is a basic oxide
D. ${\mathrm{V}}_2{\mathrm{O}}_5$ does not react …

In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is (+) ____.

The orange colour of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ and purple colour of ${\mathrm{KMnO}}_4$ is due to

Alkaline oxidative fusion of ${\mathrm{MnO}}_2$ gives "A" which on electrolytic oxidation in alkaline solution produces B . A and B respectively are:

A and B formed in the following reactions are: …

Strong reducing and oxidizing agents among the following, respectively, are

The sum of oxidation state of the metals in $\mathrm{Fe}(\mathrm{CO}{)}_5,{\mathrm{VO}}^{2+}$ and ${\mathrm{WO}}_3$ is ____:

In chromyl chloride, the number of d-electrons present on chromium is same as in (Given at no. of Ti: 22, V: 23, Cr: 24, Mn: 25, Fe: 26)

Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to

Given below are two statements

Statement I : Aqueous solution of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ is preferred as a primary standard in volumetric analysis over ${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ aqueous solution
Statement II : …

Which of the following statements are correct?
(A) The ${\mathrm{M}}^{3+}/{\mathrm{M}}^{2+}$ reduction potential for iron is greater than manganese
(B) The higher oxidation states of first row d-block elements get stabilized by oxide ion.
(C) Aqueous solution of ${\mathrm{Cr}}^{2+}$ …

Given below are two statement: one is labelled as
Assertion A and the other is labelled as Reason R
Assertion A: 5f electrons can participate in bonding to a far greater extent than 4f electrons
Reason R: 5f orbitals are not as buried as 4f orbitals
In the light of the above stat …

The pair of lanthanides in which both elements have high third-ionization energy is:

In Chromyl chloride, the oxidation state of chromium is ( + ) ____

Highest oxidation state of Mn is exhibited in ${\mathrm{Mn}}_2{\mathrm{O}}_7$. The correct statements about ${\mathrm{Mn}}_2{\mathrm{O}}_7$ are
(A) Mn is tetrahedrally surrounded by oxygen atoms
(B) Mn is octahedrally surrounded by oxygen atoms
(C) Contains …

Which one amongst the following are good oxidizing agents?
A. ${\mathrm{Sm}}^{2+}$
B. ${\mathrm{Ce}}^{2+}$
C. ${\mathrm{Ce}}^{4+}$
D. ${\mathrm{Tb}}^{4+}$

Choose the most appropriate answer from the options given below :

${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ paper acidified with dilute ${\mathrm{H}}_2{\mathrm{SO}}_4$ turns green when exposed to

How many of the following metal ions have similar value of spin only magnetic moment in gaseous state? ______
(Given: Atomic number : V, $23;\mathrm{Cr},24;\mathrm{Fe},26$; Ni, 28)
${\mathrm{V}}^{3+}.{\mathrm{Cr}}^{3+},{\mathrm{Fe}}^{2+},{\mathrm{Ni}}^{3+}$