Free Atomic Structure MCQs with Answers
922 Atomic Structure MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Atomic structure covers the discovery of the proton, Planck's quantum theory, hydrogen emission spectra and the evidence for quantized energy levels. You will use quantum numbers to describe orbitals, distinguish s, p, d and f orbital shapes, and write electronic configurations, including the correct order of electron filling.
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922 questions · page 41 of 47
- A. 4 x 10^-3 m/s
- B. 5 x 10^-4 m / s
- C. 4 x 10^-5 m/s
- D. 4 x 10^-6 m/s
Explanation: We are given:The electron is in a closed cubic box of length L = 10 cm = 0.1 mWe are to find the minimum uncertainty in its velocity…
Correct answer: 5 x 10^-4 m / s- A. 3, 2, -2, 1/2
- B. 3, 3, 1, -1/2
- C. 0, 3, 1, -1/2
- D. 3, 1, 1, -1/2
- E. Both B and C
Explanation: The correct answer is Option E both B and C : 3, 3, 1, -1/2. According to the rules of quantum numbers, the azimuthal quantum number l…
Correct answer: Both B and C- A. n = 2, l = 0, m = 0, s = +1/2
- B. n = 1, l = 1, m = 0, s = -1/2
- C. n = 1, l = 0, m = 0, s = +1/2
- D. n = 1, l = 0, m = 1, s = +1/2
Explanation: The correct four quantum numbers for an electron in the K-shell are:Principal quantum number (n) = 1, which defines the energy…
Correct answer: n = 1, l = 0, m = 0, s = +1/2- A. nh
- B. nh /2pie
- C. h/2i
- D. 2.5h/h
Explanation: The angular momentum of the electron is given by : nh/2pie where n=1,2,3...etc. and in option 'B' n=2,hence it is the correct option.
Correct answer: nh /2pie- A. The population increase is due to the number of people who are born in any year being greater than the number who dies.
- B. The population increase is due to the number of people who are born in any year being greater than the number who die.
- C. The population increase are due to the number of people who are born in any year being greater than the number who die.
- D. The population increase is due to the number of people who is born in any year being greater than the number who die.
Explanation: The population increase is due to the number of people who are born in any year being greater than the number who die.
Correct answer: The population increase is due to the number of people who are born in any year being greater than the number who die.- A. Silverdale train station can be reached by going the left at this road junction.
- B. The Silverdale train station can be reached by going left at this road junction.
- C. Silverdale train station can be reached by going left at this road junction.
- D. Silverdale train station can be reached by going to left at this road junction.
Explanation: It's correct - the phrase "can be reached by going left" properly shows direction and means the station is accessible by turning left at…
Correct answer: Silverdale train station can be reached by going left at this road junction.- A. It is a vehicle through which to teach children how to behave and how to feel about himself and others.
- B. It is a vehicle through which to teach children how to behave and how to feel about themselves and others.
- C. It is a vehicle through which to teach children how to behave and how to feel about yourselves and others.
- D. It is a vehicle through which to teach children how to behave and how to feel about themself and others.
Explanation: Option (B) is the correct choice as it uses the reflexive pronoun "themselves" correctly to refer to the children learning how to behave…
Correct answer: It is a vehicle through which to teach children how to behave and how to feel about themselves and others.- A. Canal rays
- B. Cathode rays
- C. Both a and b
- D. None
Explanation: Positive rays are called canal rays which are streams of positively charged particles found in cathode ray tubes.
Correct answer: Canal rays- A. Alpha particle
- B. Neutron
- C. Electron
- D. Proton
- E. All of these
Explanation: A neutron has no net electric charge, so it is electrically neutral, whereas an alpha particle and proton are positive and an electron is…
Correct answer: Neutron- A. Charge
- B. Mass
- C. Magnitude of charge
- D. Both A and B
Explanation: The explanation for this question will be added soon.
Correct answer: Magnitude of charge- A. 1842
- B. 1/1836
- C. 1836
- D. 1840
Explanation: Protons are 1836 times heavier than electrons.
Correct answer: 1836- A. 1838 times more than mass of proton
- B. 1836 times less than mass of proton
- C. 1836 times more than mass of neutron
- D. 1836 times more than mass of hydrogen atom
Explanation: The mass of an electron is only about 1/2000 the mass of a proton or neutron, so electrons contribute virtually nothing to the total mass…
Correct answer: 1836 times less than mass of proton- A. Isomers
- B. Protons
- C. Isotopes
- D. Nucleus
Explanation: Option A: Isomers are compounds that have the same molecular formula but different structural arrangements or spatial orientations.
Correct answer: Isotopes- A. Nature of gas
- B. Properties of gas
- C. Composition of gas
- D. All of these
Explanation: The e/m value of positive particles (anode rays) depends on the gas taken in the discharge tube. This content is given in the FSC book.
Correct answer: Nature of gas- A. 1889, electrons
- B. 1886, electrons
- C. 1836, protons
- D. 1836, electrons
Explanation: Remember that the mass of a proton is 1836 times heavier than that of an electron.
Correct answer: 1836, electrons816. The e/m value is maximum for _ gas because of _ value of "m" for positive rays obtained from it.
- A. Oxygen gas, lowest
- B. Hydrogen gas, highest
- C. Hydrogen gas, lowest
- D. Helium gas, highest
Explanation: Correct option is C. The highest value of e/m of anode rays has been observed when the discharge tube is filled with hydrogen.
Correct answer: Hydrogen gas, lowest- A. Hund's Rule
- B. Pauli's exclusion principle
- C. Aufbau's principle
- D. Heisenberg's principle
Explanation: The explanation for this question will be added soon.
Correct answer: Hund's Rule- A. N+1 rule
- B. Aufbau's principle
- C. Hund's rule
- D. It is not filled before 3d
Explanation: The explanation for this question will be added soon.
Correct answer: N+1 rule- A. 2
- B. 6
- C. 10
- D. 14
Explanation: Each p subshell holds at most 6 electrons.
Correct answer: 6- A. 4s
- B. 2p
- C. 2d
- D. 3s
Explanation: The orbital energies are compared with the help of n+l rule. The higher value of n+l, higher is the energy of the orbital.
Correct answer: 4s