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 10 of 47
- A. Angular momentum of electrons in multiples of h/2π
- B. Electrons revolve in discrete circular orbits
- C. Energy of each electron is directly proportional to n^2
- D. Electrons radiate energy continuously in a given orbit
Explanation: Bohr's atomic model, proposed in 1913, theorized that electrons in orbits would continuously radiate energy, leading to their spiralling…
Correct answer: Electrons radiate energy continuously in a given orbit- A. Principal (QN)
- B. Azimuthal (QN)
- C. spin (QN)
- D. Both a & b
Explanation: The magnetic quantum number (magnetic QN) is determined directly by the value of the azimuthal quantum number (l).
Correct answer: Azimuthal (QN)- A. 6
- B. 10
- C. 14
- D. 18
Explanation: The maximum number of electrons in a subshell is given by the formula 2(2l + 1).
Correct answer: 14- A. 5.761 Å
- B. 4.761 Å
- C. 6.671 Å
- D. 3.716 Å
Explanation: The radius of an orbit is given by,r=4π2mZe2n2h2 Substituting the values of h, m, Z=1 for hydrogen and the electron charge army be…
Correct answer: 4.761 Å- A. Temperature
- B. Pressure
- C. Volume
- D. Composition of glass
Explanation: The colour of fluorescence produced by cathode rays depends on the nature of the phosphorescent material rather than the composition of…
Correct answer: Composition of glass- A. Moving electron accelerate towards the nucleus
- B. Continuous spectrum
- C. behaviour of electron remain unexplained
- D. All
Explanation: While each point individually contributes to the shortcomings of the Rutherford model, their combined limitations made it unsatisfactory.
Correct answer: All- A. Rutherford
- B. Dalton
- C. Bohr
- D. Schrodinger
Explanation: The idea that atoms are indivisible and cannot be divided into simpler units was theorized by John Dalton.
Correct answer: Dalton- A. 6
- B. 12
- C. 20
- D. 18
Explanation: The lightest isotope of carbon is Carbon-12, which consists of 6 protons and 6 neutrons.
Correct answer: 12- A. In continuous manner
- B. in the form of heat
- C. Simultaneously
- D. discontinuous manner
Explanation: Planck's quantum theory proposed that energy is emitted or absorbed in discrete packets called "quanta." This implies that energy is…
Correct answer: discontinuous manner- A. nh/2π
- B. n2h/4π
- C. n3h/π
- D. n4h/2
Explanation: Explanation:Here,n is the principal quantum number of the orbit, andℎis Planck's constant
Correct answer: nh/2π- A. 1
- B. 3
- C. 5
- D. 7
Explanation: The maximum number of orbitals in a subshell is given by 2l+1, where l is the azimuthal quantum number.For l=3, the maximum number of…
Correct answer: 7- A. Degenerate orbitals
- B. Bonding molecular orbitals
- C. Anti bonding molecular orbitals
- D. Half tilled orbitals
Explanation: Atomic orbitals that have the same energy level are referred to as degenerate orbitals.
Correct answer: Degenerate orbitals- A. Orbit is cylindrical
- B. Orbit is elliptical
- C. orbital is longitudinal
- D. Orbit is asymmetrical
Explanation: Sommerfeld's modification to Bohr's model included the introduction of elliptical orbits, which allowed for a more accurate description of…
Correct answer: Orbit is elliptical- A. Beta-rays
- B. Alpha-rays
- C. X-rays
- D. Gamma-rays
Explanation: When electrons collide with heavy metals, the deceleration of the electrons can lead to the emission of electromagnetic radiation in the…
Correct answer: Gamma-rays195. Planck's equation
- A. E = mc^2
- B. mvr = nh/2 π
- C. E = hv
- D. λ = h/mv
Explanation: The correct equation associated with Planck's work on quantum theory is (c)E=hν, where:E is the energy of the quantum,ℎ is Planck's…
Correct answer: E = hv- A. Orbital
- B. orbit
- C. subshell
- D. Electron cloud
Explanation: The space around the nucleus where the probability of finding an electron is maximum is called an orbital.
Correct answer: Orbital- A. n
- B. l
- C. m
- D. s
Explanation: The principal quantum number (n) is the quantum number that primarily determines the energy level of an electron in an atom
Correct answer: n- A. electron
- B. positron
- C. Neutron
- D. None of above has such capability
Explanation: Positrons are the antiparticles of electrons, and when they come into contact with protons, they can annihilate each other.
Correct answer: positron- A. Milk
- B. honey
- C. oil
- D. Water
Explanation: Positrons are the antiparticles of electrons, and when they come into contact with protons, they can annihilate each other.
Correct answer: oil- A. Zeeman effect
- B. Photoelectric effect
- C. Stark effect
- D. Compton effect
Explanation: The splitting of spectral lines when atoms are subjected to a strong electric field is called Stark effect.
Correct answer: Stark effect