d and f Block Elements — JEE Main PYQs

The nature of oxides ${\mathrm{V}}_2{\mathrm{O}}_3$ and CrO is indexed as ' X ' and ' Y ' type respectively. The correct set of $X$ and $Y$ is:

The number of $f$ electrons in the ground state electronic configuration of $\mathrm{Np}(Z=93)$ is ______. (Nearest integer)

The Eu²⁺ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63]

In the structure of the dichromate ion, there is a :

Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature? (Given Z for $\mathrm{Nd}=60,\mathrm{Yb}=70,\mathrm{La}=57,\mathrm{Ce}=58$ )

Given below are two statements:
Statements I :Potassium permanganate on heating at 573 K forms potassium manganate.
Statement II: Both potassium permanganate and potassium manganate are tetrahedral and paramagnetic in nature.
In the light of the above statements, choose the most …

What is the spin- only magnetic moment value (BM) of divalent metal ion with atomic number 25, in it's aqueous solution?

The correct order of following 3d metal oxides, according to their oxidation numbers is:
(a) ${\mathrm{CrO}}_3$
(b) ${\mathrm{Fe}}_2{\mathrm{O}}_3$
(c) ${\mathrm{MnO}}_2$
(d) ${\mathrm{V}}_2{\mathrm{O}}_5$
(e) ${\mathrm{Cu}}_2\mathrm{O}$

Identify the element for which electronic configuration in +3 oxidation state is $[\mathrm{Ar}]3{\mathrm{d}}^5$:

Identify $A$ in the following reaction.
(see reaction scheme)

In the given chemical reaction, colors of the ${\mathrm{Fe}}^{2+}$ and ${\mathrm{Fe}}^{3+}$ ions, are respectively:

Given below are two statement: one is labelled as Assertion $\mathbf{A}$ and the other is labelled as Reason R:
Assertion A: Size of $\mathrm{Bk}{}^{3+}$ ion is less than $\mathrm{Np}{}^{3+}$ ion.
Reason R: The above is a consequence of the lanthanoid contraction.
In the light of the above s …

Given below are two statements:
Statement I: The $E^{\circ }$ value for $\mathrm{Ce}{}^{4+}/\mathrm{Ce}{}^{3+}$ is +1.74 V
Statement II: Ce is more stable in $\mathrm{Ce}{}^{4+}$ state than $\mathrm{Ce}{}^{3+}$ state
In the light of the above statements, choose the most appropriate answer from the options giv …

${\mathrm{Fex}}_2$ and ${\mathrm{Fey}}_3$ are known when x and y are:

Arrange the following metal complex / compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system.
(Atomic numbers $\mathrm{Ce}=58,\mathrm{Gd}=64$ and $\mathrm{Eu}=63$.)
(a) …

The common positive oxidation states for an element with atomic number 24, are:

In the ground state of atomic $\mathrm{Fe}(\mathrm{Z}=26)$, the spin-only magnetic moment is ______ $\times 10^{-1}\mathrm{BM}$.
(Round off to the nearest integer).
[Given $\sqrt{3}=1.73,\sqrt{2}=1.41$]

The oxide that shows magnetic property is:

Consider the following reactions:
$\mathrm{NaCl}+{\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7+\underset{\text{ (Conc.) }}{{\mathrm{H}}_2{\mathrm{SO}}_4}⟶(\mathrm{A})+$ side products
$(\mathrm{A})+\mathrm{NaOH}⟶(\mathrm{B})+$ Side products …

The sum of the total number of bonds between chromium and oxygen atoms in chromate and dichromate ions is ____

The electronic configurations of bivalent europium and trivalent cerium are: (atomic number: $\mathrm{Xe}=54,\mathrm{Ce}=58,\mathrm{Eu}=63$)

The incorrect statement is

Mischmetal is an alloy consisting mainly of:

The correct electronic configuration and spin - only magnetic moment (BM) of $\mathrm{Gd}{}^{3+}$ ($Z=64$), respectively, are:

The INCORRECT statement is:

The set that contains atomic numbers of only transition elements, is

The species that has a spin - only magnetic moment of 5.9 BM , is:
( ${\mathrm{T}}_{\mathrm{d}}=$ tetrahedral)

The lanthanoid that does NOT show +4 oxidation state is:

The elements with atomic numbers 101 and 104 belong to, respectively:

The incorrect statement(s) among (a) - (c) is (are):
(a) $\mathrm{W}(\mathrm{VI})$ is more stable than $\mathrm{Cr}(\mathrm{VI})$.
(b) in the presence of HCl , permanganate titrations provide satisfactory results.
(c) some lanthanoid oxides can be used as phosphors.

The lanthanoide that would show colour is:

The statement that is INCORRECT about the interstitial compound is:

The effect of lanthanoid contraction in the lanthanoid series of elements by the large means

$\underline{\mathrm{A}}\stackrel{4\mathrm{KOH},{\mathrm{O}}_2}{\to }\underset{\text{ (Green) }}{2\mathrm{B}}+2{\mathrm{H}}_2\mathrm{O}$
$3\mathrm{B}\stackrel{4\mathrm{HCl}}{\to }\underset{\text{ (Purple) }}{2\mathrm{C}}+{\mathrm{MnO}}_2+2{\mathrm{H}}_2\mathrm{O}$ …

The correct order of the first ionization enthalpies is

The highest possible oxidation states of uranium and plutonium, respectively, are

The element the usually does NOT show variable oxidation states is:

The pair of metal ions that can give a spin-only magnetic moment of 3.9 BM for the complex $\left[\mathrm{M}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{Cl}}_2$ is

Thermal decomposition of a Mn compound $(\mathrm{X})$ at 513 K results in compound $\mathrm{Y}$, ${\mathrm{MnO}}_2$ and a gaseous product. ${\mathrm{MnO}}_2$ reacts with NaCl and concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$ to give a pungent gas Z. $\mathrm{X}$, …

The correct order of atomic radii is :

The maximum number of possible oxidation states of actinoids are shown by

The transition element that has lowest enthalpy of atomisation is

Consider the hydrated ions of ${\mathrm{Ti}}^{2+},{\mathrm{V}}^{2+},{\mathrm{Ti}}^{3+}$ and ${\mathrm{Sc}}^{3+}$. The correct order of their spin-only magnetic moments is:

The oxidation states of Cr in $\left[\mathrm{Cr}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{Cl}}_3,\left[\mathrm{Cr}{\left({\mathrm{C}}_6{\mathrm{H}}_6\right)}_2\right]$, and …

The color of ${\mathrm{KMnO}}_4$ is due to:

Match the catalysts to the correct processes:

Catalyst
(A) ${\mathrm{TiCl}}_3$
(B) ${\mathrm{PdCl}}_2$
(C) ${\mathrm{CuCl}}_2$
(D) ${\mathrm{V}}_2{\mathrm{O}}_5$

Process
(i) Wacker process
(ii) Ziegler - Natta polymerization
(iii) Contact process
(iv) Deacon's process

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 ${\mathrm{E}}_{{\mathrm{M}}^{3+}/{\mathrm{M}}^{2+}}^0$ value?

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

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

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