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1
MHT CET 2024 16th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following series of emission spectral lines for hydrogen observed in visible region?

A
Paschen
B
Lyman
C
Pfund
D
Balmer
2
MHT CET 2024 16th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

What is wavenumber of a radiation having wavelength $0.25 \mu \mathrm{~m}$ ?

A
$2.5 \times 10^6 \mathrm{~m}^{-1}$
B
$4.0 \times 10^6 \mathrm{~m}^{-1}$
C
$6.5 \times 10^6 \mathrm{~m}^{-1}$
D
$8.0 \times 10^6 \mathrm{~m}^{-1}$
3
MHT CET 2024 16th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following species contain 20 electrons?

A
$\mathrm{K}^{+}$
B
Ca
C
Mg
D
Cl
4
MHT CET 2024 15th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Calculate the radius of first orbit of He$^+$.

A
24.45 pm
B
13.23 pm
C
48.62 pm
D
39.46 pm
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