1. The number of radial nodes in 3p orbital is:

0
1
2
3

2. Which of the following has the lowest ionization energy?

Na
Mg
Al
K

3. Which of the following is not possible according to the quantum numbers?

n = 3, l = 0, m = 0
n = 2, l = 2, m = 0
n = 4, l = 2, m = 1
n = 1, l = 0, m = 0

4. The energy of an electron in the nth orbit of hydrogen atom is given by:

-13.6/n
13.6n
-13.6/n²
-n²/13.6

5. The maximum number of electrons in a subshell is given by:

2l + 1
2n²
4l + 2
n²

6. Which of the following transitions corresponds to emission of energy?

n = 2 to n = 4
n = 3 to n = 5
n = 4 to n = 2
n = 1 to n = 3

7. The value of spin quantum number for an electron in 2s orbital is:

1
0
+1/2 or -1/2
2

8. What is the magnetic quantum number (m) for 3d orbital?

0
-1, 0, +1
-2, -1, 0, +1, +2
+2 only

9. Which rule is violated in the configuration 1s² 2s² 2p⁴ where two electrons in one p orbital have same spin?

Hund’s Rule
Pauli Exclusion Principle
Aufbau Principle
Bohr’s Rule

10. The number of orbitals in n = 3 energy level is:

9
3
6
5

IT JEE Chemistry Practice Paper 1 – Atomic Structure – PYQs

IIT JEE Chemistry Practice Paper – Part 1