d and f Block Elements

In which of the following transition metal ion (aquated) is not correctly matched with its colour?

The pair of ions with paramagnetic nature and same number of electrons is

$E_{\mathrm{M}^{3}| \mathrm{M}^{2+}}^{\circ}($ in V$)$ is highest for

Consider the following pairs of elements and identify the pairs of elements which have nearly same atomic radius.
I. Y, La
II. Zr, Hf
III. Mo, W
IV. Cr, Mo

Identify the correct statements about lanthanoids
I. $\mathrm{Ce}^{4+}$ and $\mathrm{Tb}^{4+}$ act as oxidising agents.
II. $\mathrm{Eu}^{2+}$ and $\mathrm{Yb}^{2+}$ act as oxidising agents.
III. Misch metal is an alloy of $95 \%$ iron and ...

Identify the correct statements from the following.
(i) Ti (IV) is more stable than Ti (III) and Ti (II).
(ii) Among $3 d$-series elements (From $Z=22$ to 29). Only copper has positive reduction potential $\left(M^{2+} / M\right)$.
(iii)...

Identify the element for which +1 oxidation state is more stable than +3 oxidation state.

$Y$ in the given sequence of reactions is
$$ \begin{gathered} \mathrm{P}_4+x \mathrm{NaOH}+y \mathrm{H}_2 \mathrm{O} \xrightarrow{\mathrm{CO}_2} X+z \mathrm{NaH}_2 \mathrm{PO}_2 \\ X+\mathrm{CuSO}_4 \longrightarrow Y+\mathrm{H}_2 \mathrm{SO...

Observe the following $f$-block elements$\mathrm{Eu}(Z=63) ; \mathrm{Pu}(Z=94) ; \mathrm{Cf}(Z=98)$;$\operatorname{Sm}(Z=62) ; \mathrm{Gd}(Z=64) ; \mathrm{Cm}(Z=96)$How many of the above have half-filled $f$-orbitals in their ground state?

Match the following .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th...

The set of elements which obey the general electronic configuration $(n-1) d^{1-10} n s^2$ is?

Which of the following orders is correct for the property given?

The alloy formed by beryllium with ' $X$ ' is used in the preparation of high strength springs. ' $X$ ' is

Among the following the incorrect statement about transition metals is

The product formed during thermal decomposition of ammonium dichromate are

In +2 oxidation state, which of the following lanthanoids act as reducing agents?

Observe the following ions
\(\mathrm{V}^{2+}, \mathrm{Zn}^{2+}, \mathrm{Cu}^{2+}, \mathrm{Fe}^{2+}, \mathrm{Fe}^{3+}, \mathrm{Ti}^{3+}, \mathrm{Sc}^{3+}, \mathrm{Ti}^{4+}, \mathrm{Ni}^{3+}, \mathrm{Co}^{3+}, \mathrm{Cu}^{+}\)
How many ion...

The number $f$-electrons in +3 oxidation state of gadolinium $(Z=64)$ is $x$ and in +2 oxidation state of ytterbium $(Z=70)$ is $y$. The sum of $x$ and $y$ is

The order of melting points of $\mathrm{Cr}, \mathrm{Mo}$ and W is

The elements with full $d^{10}$ electronic configuration in their " +2 " oxidation state are

Assertion (A) Mo has the ground state electronic configuration $4 d^5 5 s^1$.
Reason (R) Mo has the highest exchange energy among the second row transition elements.
The correct option among the following is

Choose the correct statement.
$\mathrm{Fe}^{3+}$ ion is more stable than $\mathrm{Fe}^{2+}$ ion because

On treating $\mathrm{SO}_2$ with aqueous solution of $\mathrm{KMnO}_4$, the manganese ion reduces to

When permanganate ion is heated at 513 K , led to the formation of two manganese based products. The physical properties of the product in which manganese with the higher oxidation state than the other are

The correct order of ionic radii of trivalent ions $\mathrm{Y}^{3+}, \mathrm{La}^{3+}, \mathrm{Eu}^{3+}$ and $\mathrm{Lu}^{3+}$ is $(\mathrm{Y}=39, \mathrm{La}=57, \mathrm{Eu}=63, \mathrm{Lu}=71)$

Identify all the correct statements for lanthanoide contraction.
(A) The covalent properties of the lanthanoide metal hydroxides increases from La to Lu.
(B) The chemical reactivity decreases from La to Lu.
(C) $\mathrm{La}(\mathrm{OH})_3$ ...

The valency shell electronic configuration of Cr and Cu atoms, respectively, are

The increase in the atomic radii of the third (5d) series of transition elements is very small, which may be accounted for the filling of ' $X$ ' orbitals before ${ }^{\prime} Y^{\prime}$ orbitals $X$ and $Y$ are

Assertion (A) In general, transition metals have high melting points.
Reason (R) More number of electrons from ' $(n-1) d^{\prime}$ and ' $n s$ ' are involved in interatomic metallic bonding.
The correct option among the following is

Which of the following is a diamagnetic ion?

Trans uranium elements are

What is the oxidation state of Cr , when the pH of the aqueous solution of potassium dichromate changes from acidic to basic?

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

Which of the following statement is not true about interstitial complexes?

The highest oxidation state observed in first row transition metals is

Among the following series of transition metal ions, the one in which all the metal ions have $3 d^2, 3 p^6$ electronic configuration is
(Atomic number, $\mathrm{Ti}=22, \mathrm{~V}=23, \mathrm{Cr}=24$, $\mathrm{Mn}=25$ )