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

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is:

The orientation of an atomic orbital is governed by:

1. azimuthal quantum number

2. spin quantum number

3. magnetic quantum number

4. principal quantum number

If the mass of electron is 9.11×10^-31 kg  and the planck's constant is 6.626 ×10^-34 Js, then the uncertainty involved in the measurement of velocity within a distance of 0.1 Å is:

1. $5.79\times {10}^6$ $m{s}^{-1}$

2. $5.79\times {10}^7$ $m{s}^{-1}$

3. $5.79\times {10}^8$ $m{s}^{-1}$

4. $5.79\times {10}^5$ $m{s}^{-1}$

An element X has the following isotopic composition: 
²⁰⁰X: 90% 
¹⁹⁹X: 8.0% 
²⁰²X: 2.0% 
The weighted average atomic mass of the naturally-occurring element X is closest to:

1. 200 amu
2. 201 amu
3. 202 amu
4. 199 amu

Consider the following sets of quantum numbers: 
 
Which of the following sets of quantum numbers is not possible?

1. ii, iii, and iv
2. i, ii, iii, and iv
3. ii, iv and v
4. i and iii

If uncertainty in position and momentum are equal, then the uncertainty in velocity is:

1. $\frac{1}{2\mathrm{m}}\sqrt{\frac{\mathrm{h}}{\mathrm{\pi }}}$

2. $\sqrt{\frac{\mathrm{h}}{2\mathrm{\pi }}}$

3. $\frac{1}{\mathrm{m}}\sqrt{\frac{\mathrm{h}}{\mathrm{\pi }}}$

4. $\sqrt{\frac{\mathrm{h}}{\mathrm{\pi }}}$

The incorrect set of quantum numbers among the following is:

1. n= 4, l= 0, m= 0, s= -1/2
2. n= 5, l= 3, m= 0, s= +1/2
3. n= 3, l= 2, m= -3, s= -1/2
4. n= 3, l= 2, m= 2, s= -1/2

The rule used to determine the maximum number of electrons in a subshell of an atom is: