WBJEE PYQs for Structure of Atom with Solutions: Practice WBJEE Previous Year Questions

Updated 3+ months ago

Structure of Atom is an important topic in the Chemistry section in WBJEE exam. Practising this topic will increase your score overall and make your conceptual grip on WBJEE exam stronger.

This article gives you a full set of WBJEE PYQs for Structure of Atom with explanations for effective preparation. Practice of WBJEE Chemistry PYQs including Structure of Atom questions regularly will improve accuracy, speed, and confidence in the WBJEE 2026 exam.

WBJEE PYQs for Structure of Atom with Solutions

1.
The maximum number of 2p electrons with electronic spin $=-\frac{1}{2}$ are
- 6
- 0
- 2
- 3
View Solution
2.
Which of the following expressions gives the de-Broglie relationship?
- $ p=\frac{h}{mv} $
- $ \lambda =\frac{h}{mv} $
- $ \lambda =\frac{h}{mp} $
- $ \lambda \,m=\frac{v}{p} $
View Solution
3.
For the Paschen series the values of $n_{1}$ and $n_{2}$ in the expression $\Delta E=Rhc\left(\frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}}\right)$ are
- $n_{1}=1, n_{2}=2,3,4 ........$
- $n_{1}=2, n_{2}=3,4,5 ........$
- $n_{1}=3, n_{2}=4,5,6 ........$
- $n_{1}=4, n_{2}=5,6,7 ........$
View Solution
4.
In Sommerfeld?s modification of Bohr?s theory, the trajectory of an electron in a hydrogen atom is
- a perfect ellipse
- a closed ellipse - like curve, narrower at the perihelion position and flatter at the aphelion position
- a closed loop on spherical surface
- a rosette
View Solution
5.
The electronic configuration $1 s^{2},\, 2 s^{2} 2 p^{6},\, 3 s^{2} 3 p^{6} 3 d^{9}$ represents a
- metal atom
- non metal atom
- non-metallic anion
- metallic cation
View Solution
6.
For the Paschen series the values of n1 and n2 in the expression $Δ E = R h c (\frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}})$
- (A) n1= 1, n2= 2, 3, 4........
- (B) n1= 2, n2= 3, 4, 5........
- (C) n1= 3, n2= 4, 5, 6........
- (D) n1= 4, n2= 5, 6, 7........
View Solution
7.
Which one of the following electronic arrangements is absurd ?
- n = 3, l = 1, m = -1
- n = 3, l = 0, m = 0
- n = 2, l = 0, m = -1
- n = 2, l = 1, m = 0
View Solution
8.
For $N^{3-} >O^{2-}>F^{-} and Na^{+},$ the order in which their ionic radii varies is
- $N^{3-}>O^{2-}>F->Na^{+}$
- $N^{2-}>Na^{+}>O^{2-}>F-$
- $Na^{+}>O^{2-}>N^{3-}>F-$
- $O^{2-}>F->Na^{+}>N^{3-}$
View Solution
9.
Which of the following does not represent the mathematical expression for the Heisenberg uncertainty principle?
- $\Delta x . \Delta P\, \ge\, \frac{h}{\left(4\pi\right)}$
- $\Delta x . \Delta\,v \,\ge\, \frac{h}{\left(4\pi m\right)}$
- $\Delta E . \Delta t \, \ge\, \frac{h}{\left(4\pi\right)}$
- $\Delta E . \Delta x \,\ge\, \frac{h}{\left(4\pi\right)}$
View Solution
10.
At a certain temperature, the vapour pressures of benzene and toluene are 119 torr and 37 torr, respectively. The mole fraction of toluene in the vapour phase, which is in equilibrium with a solution of benzene and toluene in 1 : 1 molar ratio, is
- (A) 0.237
- (B) 0.5
- (C) 0.763
- (D) None of these
View Solution
11.
The vapour pressure of water at 20 °C is 17.5 torr. What will be the no. of moles of water present in one litre of air at 20 °C and 40% relative humidity. (R =0.082 L atm/mol-k)
- (A) 4.2 × 10^–4 mole
- (B) 4.2 × 10^–6 mole
- (C) 3.82 × 10^–4 mole
- (D) 3.82 × 10^–6 mole
View Solution
12.
$1$ mole of photon, each of frequency $2500\,s^{-1},$ would have approximately a total energy of :
- 1 erg
- 1 Joule
- 1 eV
- 1 MeV
View Solution
13.
If the first ionization energy of $H$ atom is $13.6\, eV$, then the $2^{nd}$ ionization energy of He atom is
- $27.2\, eV$
- $40.8\, eV$
- $54.4\, eV$
- $108.8\, eV$
View Solution
14.
Identify the CORRECT statement
- Quantum numbers $(n,I,m,s)$ are obtained arbitrarily
- All the Quantum numbers $(n,I,m,s)$ for any pair of electrons in an atom can be identical under special circumstance
- All the Quantum numbers $(n,I,m,s)$ for any pair of electrons in an atom cannot be identical under special circumstance
- All the quantum numbers $(n,I,m,s)$ are required to describe an electron of an atom completely
View Solution
15.
If a species has $16$ protons, $18$ electrons and $16$ neutrons, find the species and its charge
- $S^{1-}$
- $Si^{2-}$
- $P^{3-}$
- $S^{2-}$
View Solution

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WBJEE PYQs for Structure of Atom with Solutions

1.The maximum number of 2p electrons with electronic spin $=-\frac{1}{2}$ are

2.Which of the following expressions gives the de-Broglie relationship?

3.For the Paschen series the values of $n_{1}$ and $n_{2}$ in the expression $\Delta E=Rhc\left(\frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}}\right)$ are

4.In Sommerfeld?s modification of Bohr?s theory, the trajectory of an electron in a hydrogen atom is

5.The electronic configuration $1 s^{2},\, 2 s^{2} 2 p^{6},\, 3 s^{2} 3 p^{6} 3 d^{9}$ represents a

6.For the Paschen series the values of n1 and n2 in the expression ΔE=Rhc(1n12−1n22)

7.Which one of the following electronic arrangements is absurd ?

8.For $N^{3-} >O^{2-}>F^{-} and Na^{+},$ the order in which their ionic radii varies is

9.Which of the following does not represent the mathematical expression for the Heisenberg uncertainty principle?

10.At a certain temperature, the vapour pressures of benzene and toluene are 119 torr and 37 torr, respectively. The mole fraction of toluene in the vapour phase, which is in equilibrium with a solution of benzene and toluene in 1 : 1 molar ratio, is

11.The vapour pressure of water at 20 °C is 17.5 torr. What will be the no. of moles of water present in one litre of air at 20 °C and 40% relative humidity. (R =0.082 L atm/mol-k)

12.$1$ mole of photon, each of frequency $2500\,s^{-1},$ would have approximately a total energy of :

13.If the first ionization energy of $H$ atom is $13.6\, eV$, then the $2^{nd}$ ionization energy of He atom is

14.Identify the CORRECT statement

15.If a species has $16$ protons, $18$ electrons and $16$ neutrons, find the species and its charge

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1.
The maximum number of 2p electrons with electronic spin $=-\frac{1}{2}$ are

2.
Which of the following expressions gives the de-Broglie relationship?

3.
For the Paschen series the values of $n_{1}$ and $n_{2}$ in the expression $\Delta E=Rhc\left(\frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}}\right)$ are

4.
In Sommerfeld?s modification of Bohr?s theory, the trajectory of an electron in a hydrogen atom is

5.
The electronic configuration $1 s^{2},\, 2 s^{2} 2 p^{6},\, 3 s^{2} 3 p^{6} 3 d^{9}$ represents a

6.
For the Paschen series the values of n1 and n2 in the expression $Δ E = R h c (\frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}})$

7.
Which one of the following electronic arrangements is absurd ?

8.
For $N^{3-} >O^{2-}>F^{-} and Na^{+},$ the order in which their ionic radii varies is

9.
Which of the following does not represent the mathematical expression for the Heisenberg uncertainty principle?

10.
At a certain temperature, the vapour pressures of benzene and toluene are 119 torr and 37 torr, respectively. The mole fraction of toluene in the vapour phase, which is in equilibrium with a solution of benzene and toluene in 1 : 1 molar ratio, is

11.
The vapour pressure of water at 20 °C is 17.5 torr. What will be the no. of moles of water present in one litre of air at 20 °C and 40% relative humidity. (R =0.082 L atm/mol-k)

12.
$1$ mole of photon, each of frequency $2500\,s^{-1},$ would have approximately a total energy of :

13.
If the first ionization energy of $H$ atom is $13.6\, eV$, then the $2^{nd}$ ionization energy of He atom is

14.
Identify the CORRECT statement

15.
If a species has $16$ protons, $18$ electrons and $16$ neutrons, find the species and its charge