1
JEE Main 2022 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which of the following sets of quantum numbers is not allowed?

A
$$ \mathrm{n}=3,1=2, \mathrm{~m}_{\mathrm{l}}=0, \mathrm{~s}=+\frac{1}{2} $$
B
$$ \mathrm{n}=3, \mathrm{l}=2, \mathrm{~m}_{\mathrm{l}}=-2, \mathrm{~s}=+\frac{1}{2} $$
C
$$ \mathrm{n}=3, \mathrm{l}=3, \mathrm{~m}_{\mathrm{l}}=-3, \mathrm{~s}=-\frac{1}{2} $$
D
$$ \mathrm{n}=3, \mathrm{l}=0, \mathrm{~m}_{1}=0, \mathrm{~s}=-\frac{1}{2} $$
2
JEE Main 2022 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The depression in freezing point observed for a formic acid solution of concentration $$0.5 \mathrm{~mL} \mathrm{~L}^{-1}$$ is $$0.0405^{\circ} \mathrm{C}$$. Density of formic acid is $$1.05 \mathrm{~g} \mathrm{~mL}^{-1}$$. The Van't Hoff factor of the formic acid solution is nearly : (Given for water $$\mathrm{k}_{\mathrm{f}}=1.86\, \mathrm{k} \,\mathrm{kg}\,\mathrm{mol}^{-1}$$ )

A
0.8
B
1.1
C
1.9
D
2.4
3
JEE Main 2022 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

$$20 \mathrm{~mL}$$ of $$0.1\, \mathrm{M} \,\mathrm{NH}_{4} \mathrm{OH}$$ is mixed with $$40 \mathrm{~mL}$$ of $$0.05 \mathrm{M} \mathrm{HCl}$$. The $$\mathrm{pH}$$ of the mixture is nearest to :

(Given : $$\mathrm{K}_{\mathrm{b}}\left(\mathrm{NH}_{4} \mathrm{OH}\right)=1 \times 10^{-5}, \log 2=0.30, \log 3=0.48, \log 5=0.69, \log 7=0.84, \log 11= 1.04)$$

A
3.2
B
4.2
C
5.2
D
6.2
4
JEE Main 2022 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The IUPAC nomenclature of an element with electronic configuration [Rn] $$5 \mathrm{f}^{14} 6 \mathrm{d}^{1} 7 \mathrm{s}^{2}$$ is :

A
Unnilbium
B
Unnilunium
C
Unnilquadium
D
Unniltrium
JEE Main Papers
2023
2021
EXAM MAP