Structure of Atom Practice Questions
NEET · Chemistry · 1629 free MCQs with instant results and detailed explanations.
1629
Total
325
Easy
749
Medium
555
Hard
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Topics in Structure of Atom
Bohr Model
438
Quantum Numbers
399
Aufbau Principle
431
Electronic Configuration
361
Sample Questions from Structure of Atom
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which of the following statements about the Bohr model of the atom is correct?
A.
Electrons move in fixed orbits around the nucleus.
B.
Electrons can exist in any energy level.
C.
The nucleus is positively charged with no mass.
D.
Electrons emit energy when moving to a higher orbit.
Show Answer & Explanation
Correct Answer: A
In the Bohr model, electrons are restricted to fixed orbits around the nucleus, each with a specific energy level. This is a fundamental concept of the model.
Q2
Easy
In the Bohr model, what happens when an electron jumps from a higher energy level to a lower energy level?
A.
The electron absorbs energy.
B.
The electron emits energy.
C.
The electron does not change energy.
D.
The electron disappears.
Show Answer & Explanation
Correct Answer: B
When an electron transitions from a higher energy level to a lower one, it releases energy in the form of light, which corresponds to the difference in energy between the two levels.
Q3
Easy
What is the formula for the radius of the nth orbit in a hydrogen atom according to the Bohr model?
A.
r_n = n^2 * 0.529 ร
B.
r_n = n / 0.529 ร
C.
r_n = 0.529 / n^2 ร
D.
r_n = 0.529 * n ร
Show Answer & Explanation
Correct Answer: A
The radius of the nth orbit in the hydrogen atom is given by the formula r_n = n^2 * 0.529 ร
, where n is the principal quantum number.
Q4
Medium
Which of the following statements about the Bohr model of the hydrogen atom is correct?
A.
Electrons can occupy any energy level.
B.
The angular momentum of the electron is quantized.
C.
Electrons can exist between energy levels.
D.
The nucleus emits radiation continuously.
Show Answer & Explanation
Correct Answer: B
In the Bohr model, the angular momentum of the electron in its orbit is quantized and is given by the formula L = n(h/2ฯ), where n is a positive integer.
Q5
Medium
Calculate the energy of the first orbit of a hydrogen atom using the Bohr model. (Given: Rydberg constant R = 13.6 eV)
A.
-13.6 eV
B.
-3.4 eV
C.
0 eV
D.
-54.4 eV
Show Answer & Explanation
Correct Answer: A
The energy of the electron in the first orbit (n=1) of hydrogen is -13.6 eV, as calculated using E_n = -R/nยฒ.
Q6
Medium
What is the radius of the second orbit of a hydrogen atom according to the Bohr model? (Given: Bohr radius a_0 = 0.529 ร
)
A.
0.529 ร
B.
2.12 ร
C.
1.06 ร
D.
0.2645 ร
Show Answer & Explanation
Correct Answer: B
The radius of the nth orbit is given by r_n = nยฒ * a_0, hence for n=2, r_2 = 2ยฒ * 0.529 ร
= 2.12 ร
.
Q7
Medium
In the Bohr model, what happens to the energy of an electron when it jumps from a higher orbit to a lower orbit?
A.
The energy increases.
B.
The energy decreases.
C.
The energy remains the same.
D.
The energy fluctuates randomly.
Show Answer & Explanation
Correct Answer: B
When an electron jumps from a higher orbit to a lower orbit, it loses energy, which is emitted as a photon.
Q8
Hard
In the Bohr model of the hydrogen atom, if the radius of the first orbit is 0.53 ร
, what is the radius of the second orbit?
A.
0.53 ร
B.
2.12 ร
C.
1.06 ร
D.
0.27 ร
Show Answer & Explanation
Correct Answer: B
According to the Bohr model, the radius of the nth orbit is given by r_n = nยฒ * rโ, where rโ is the radius of the first orbit (0.53 ร
). For the second orbit (n=2), r_2 = 2ยฒ * 0.53 ร
= 4 * 0.53 ร
= 2.12 ร
.
Q9
Hard
According to the Bohr model, which of the following statements about the electron's energy levels is TRUE?
A.
Electrons can reside between energy levels.
B.
The energy of an electron increases with increasing distance from the nucleus.
C.
The energy levels are equally spaced.
D.
Electrons in lower energy levels have higher energy than those in higher levels.
Show Answer & Explanation
Correct Answer: B
In the Bohr model, energy levels are quantized, and as an electron occupies orbits further from the nucleus, the potential energy increases due to reduced electrostatic attraction. Thus, the energy of an electron increases with increasing distance from the nucleus.
Q10
Hard
What is the wavelength of the photon emitted when an electron transitions from the n=3 level to the n=2 level in a hydrogen atom? (Use Rydberg's formula: 1/ฮป = R(1/n1ยฒ - 1/n2ยฒ), R = 1.097 x 10^7 mโปยน)
A.
6.56 x 10^-7 m
B.
4.86 x 10^-7 m
C.
3.66 x 10^-7 m
D.
2.44 x 10^-7 m
Show Answer & Explanation
Correct Answer: B
Using Rydberg's formula, for n1=2 and n2=3, we find 1/ฮป = R(1/2ยฒ - 1/3ยฒ) = (1.097 x 10^7)(1/4 - 1/9) = 1.097 x 10^7 * (5/36). Solving gives ฮป = 4.86 x 10^-7 m.
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Structure of Atom โ NEET Chemistry Practice Questions Online
This page contains 1629 practice MCQs for the chapter Structure of Atom in NEET Chemistry. The questions are organized by difficulty โ 325 easy, 749 medium, 555 hard โ so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.