Download App

4. d and f- block elements — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
An elements in $+3$ oxidation state has the electronic configuration $(Ar)3{d^3}$. Its atomic number is
  • ✓
    $24$
  • B
    $23$
  • C
    $22$
  • D
    $21$
✓

Answer

Correct option: A.
$24$
a
It’s Obvious.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 4. d and f- block elements→4. d and f- block elements — all question types→Chemistry STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

If monosaccharide contains an aldehyde group, it is known as
→
Which will give white ppt. with $AgNO_3$ ?
→
Select the correct order of $\Delta /CFSE$.
→
The specific conductivity of a saturated solution of silver chloride is $2 \times 10^{-6}\, S\,cm^{-1}$ at $25\,^oC.$ What will be the solubility of silver chloride at $25\,^oC$ if molar conductivities at infinite dilution of $Ag^+$ and $Cl^-$ ions are $60$ and $80\,S\,cm^2\,mol^{-1}$ respectively -
→
A $0.5$ percent solution of potassium chloride was found to freeze at $-0.24^{\circ} C$. The percentage dissociation of potassium chloride is .... (Nearest integer)

(Molal depression constant for water is $1.80\, K\, kg\,mol ^{-1}$ and molar mass of $KCl$ is $74.6 \,g\, mol ^{-1}$ )

→
The higher number of unpaired electrons are in
→
Given the best condition for this transformation:
→
In a photochemical reaction, the ratio of number of dissociate molecules and number of quanta of absorbed energy is called
→
Which one does not exist ?
→
Identify the incorrect statement among the following
→