1
JEE Main 2023 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The shortest wavelength of hydrogen atom in Lyman series is $$\lambda$$. The longest wavelength is Balmer series of He$$^+$$ is

A
$$\frac{36\lambda}{5}$$
B
$$\frac{5}{9\lambda}$$
C
$$\frac{9\lambda}{5}$$
D
$$\frac{5\lambda}{9}$$
2
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The radius of the $$\mathrm{2^{nd}}$$ orbit of $$\mathrm{Li^{2+}}$$ is $$x$$. The expected radius of the $$\mathrm{3^{rd}}$$ orbit of $$\mathrm{Be^{3+}}$$ is

A
$$\frac{16}{27}x$$
B
$$\frac{4}{9}x$$
C
$$\frac{9}{4}x$$
D
$$\frac{27}{16}x$$
3
JEE Main 2023 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The number of s-electrons present in an ion with 55 protons in its unipositive state is

A
10
B
9
C
12
D
8
4
JEE Main 2023 (Online) 24th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The magnetic moment of a transition metal compound has been calculated to be 3.87 B.M. The metal ion is

A
Ti$$^{2+}$$
B
V$$^{2+}$$
C
Cr$$^{2+}$$
D
Mn$$^{2+}$$
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