List of top Chemistry Questions on d -and f -Block Elements

(a) $[Cr(H_2O)_6]^{+3}$	(i) $t^2_{2g}eg^0$
(b) $[Fe(H_2O)_6]^{+3}$	(ii) $t^3_{2g}eg^0$
$(c) [Ni(H_2O)_6]^{+2}$	(iii) $t^3_{2g}eg^2$
(d) $[V(H_2O)_6]^{+3}$	(iv) $t^6_{2g}eg^2$

Element not present in Nessler’s reagent is

For a metal ion, the calculated magnetic moment is 4.90 BM. This metal ion has ______ number of unpaired electrons.

The pair of lanthanides will exceptionally high 3^rd ionisation enthalpy than neighbouring elements:

Consider the reaction

Cu^{2+} + X^- → Cu_2X_2 + X_2

.
X² will be predominantly?

Cobalt chloride when dissolved in water forms pink colored complex $X$ which has octahedral geometry. This solution on treating with cone $HCl$ forms deep blue complex, $\underline{Y}$ which has a $\underline{Z}$ geometry $X, Y$ and $Z$ , respectively, are

The spin-only magnetic moment value of

M ^{3+}

ion (in gaseous state) from the pairs

Cr ^{3+} / Cr ^{2+}, Mn ^{3+} / Mn ^2, \quad Fe ^{3+} / Fe ^{2+}

and

Co ^{3+} / Co ^{2+}

that has negative standard electrode potential, is BM [Nearest integer]

Which of the following elements have half-filled f-orbitals in their ground state?
(Given : atomic number $Sm =62 ; Eu =63 ; Tb =65 ; Gd =64, Pm =61$ )
A. $Sm$
B. $Eu$
C. $Tb$
D. $Gd$
E. $Pm$
Choose the correct answer from the options given below :

During the qualitative analysis of

SO _3^2

using dilute

H _2 SO _4, SO _2

gas is evolved which turns

K _2 Cr _2 O _7

solution (acidified with dilute

H _2 SO _4

) :

For which of the following aqueous ion, spin only magnetic moment is 3.87 BM?

Which one amongst the following are good oxidizing agents?
(A) $\text{Sm}^{\text{2+}}$
(B) $\text{Ce}^{\text{2+}}$
(C) $\text{Ce}^{\text{4+}}$
(D) $\text{Tb}^{\text{4+}}$
Choose the most appropriate answer from the options given below: