Given below are two statements:

Assertion (A):	The splitting of spectral lines in an electric field is called the stark effect.
Reason (R):	It is explained by Bohr's theory.

In the light of the above statements, choose the most appropriate answer from the options given below:

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	(A) is False but (R) is True.

The radii of the first bohr orbit of H(r_H), He⁺ (r_He⁺) and Li2+(r_Li²⁺) are in the order:

1.  r_H = r_He⁺ = r_Li⁺²

2.  r_H < r_He⁺ < r_Li²⁺

3.  r_H > r_He⁺ > r_Li²⁺

4.  r_He⁺ < r_H < r_Li²⁺

The number of protons, neutrons and electrons in  \( _{71}^{175}Lu\) respectively, are:

1. 104, 71 and 71

2. 71, 71 and 104

3. 175, 104 and 71

4. 71, 104 and 71

Orbital having 3 angular nodes and 3 total nodes is:

1. 5 p
2. 3 d
3. 4 f
4. 6 d

The number of electrons plus neutrons in \(_{19}^{40}K^{+}\) is:

1.  38

2.  59

3.  39

4.  40

In a ground-state phosphorous atom in the gas phase, how many electrons have quantum numbers n = 3, l = 1, m_l = –1?

1.  0

2.  1

3.  2

4.  3

Which of the following options does not represent ground state electronic configuration of an atom?

1. $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{8}4{\mathrm{s}}^2$

2. $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{9}4{\mathrm{s}}^2$

3. $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{10}4{\mathrm{s}}^1$

4. $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{5}4{\mathrm{s}}^1$

Match the ensuing rules with the corresponding statements:
 

If the velocity of an electron in Bohr’s first orbit is 3.19 x 10⁶ ms^-1, then the de Broglie wavelength associated with it would be:

1. 314 pm
2. 456 pm
3. 228 pm
4. 560 nm

Which of the following series of transitions in the spectrum of hydrogen atoms falls in the visible region?

1. Brackett series

2. Lyman series

3. Balmer series

4. Paschen series