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 16 of 47
- A. K < Ca < Rb < Ba
- B. Ca < K < Rb < Ba
- C. Ca < K < Ba < Rb
- D. K < Ca < Ba < Rb
Explanation: The correct order of increasing atomic size among potassium (K), calcium (Ca), rubidium (Rb), and barium (Ba) is:b.
Correct answer: Ca < K < Rb < Ba- A. Li
- B. Ne
- C. Rb
- D. Sr
Explanation: The correct answer is:b. NeAtomic radius generally decreases across a period (from left to right) in the periodic table and increases down…
Correct answer: Ne- A. Na < Sr < O < F
- B. Sr < Na < O < F
- C. Sr < Na < F < O
- D. Na < Sr < F < O
Explanation: The correct arrangement of sodium (Na), oxygen (O), fluorine (F), and strontium (Sr) on the basis of increasing first ionization energy…
Correct answer: Sr < Na < O < F- A. low, very negative
- B. high, positive or slightly negative
- C. low, positive or slightly negative
- D. high, very negative
Explanation: The correct option is:c. low, positive or slightly negativeElements with low first ionization energies are more likely to lose electrons…
Correct answer: low, positive or slightly negative- A. 0.2m
- B. 0.2nm
- C. 2 x 10^-10nm
- D. 0.2Pm
Explanation: The diameter of an atom is typically in the range of angstroms (Å) or nanometers (nm).
Correct answer: 2 x 10^-10nm- A. H2
- B. He
- C. N2
- D. O2
Explanation: The rate of effusion of a gas is inversely proportional to the square root of its molar mass, according to Graham's law of effusion.
Correct answer: O2- A. 0.082 L.atm.mol-1.K
- B. 0.082 L.atm.mol-1.K-1
- C. 0.82 L.atm.mol.K-1
- D. 0.82 L.atm.mol.K
Explanation: The ideal gas law is represented by the equation PV=nRT, where:P is the pressure of the gas,V is the volume of the gas,n is the number of…
Correct answer: 0.082 L.atm.mol-1.K- A. definite volume
- B. definite shape
- C. crystalline structure
- D. no crystalline structure
Explanation: Glass is an amorphous material with no well-defined crystal lattice. It is formed by rapidly cooling a molten material (such as silica) to…
Correct answer: no crystalline structure- A. can be liquefied
- B. have different boiling points
- C. are gases at room temperature
- D. have different densities
Explanation: Fractional distillation is a separation technique based on differences in boiling points of components in a mixture.
Correct answer: have different boiling points- A. Ar < HCI < HI
- B. HI > HCI > Ar
- C. HCI < HI < Ar
- D. HI > Ar > HCI
Explanation: Argon (Ar) is a noble gas and exists as individual atoms with weak van der Waals forces between them.
Correct answer: Ar < HCI < HI- A. greater than that of egg "A"
- B. less than that of egg "A"
- C. equal to that of egg "A"
- D. unaffected instead
Explanation: When an egg is placed in a hypertonic solution (such as hydrochloric acid), water moves out of the egg through osmosis.
Correct answer: greater than that of egg "A"- A. NaCI
- B. RbCI
- C. LiCI
- D. CsCI
Explanation: The melting point of an ionic compound is influenced by factors such as the strength of the ionic bonds and the size of the ions.
Correct answer: NaCI- A. zero potential energy
- B. infinite potential energy
- C. maximum potential energy
- D. minimum potential energy
Explanation: In a crystal, the atoms are arranged in a repeating and orderly pattern.
Correct answer: minimum potential energy- A. KCI
- B. MgO
- C. LiBr
- D. NaF
Explanation: Lattice energy is the energy required to completely separate one mole of a solid ionic compound into its gaseous ions.
Correct answer: MgO- A. meniscus is concave
- B. meniscus is convex
- C. meniscus is plane
- D. meniscus may be concave or convex depending on the nature of the metal
Explanation: In a cylindrical container, the meniscus is the curve observed at the surface of a liquid.
Correct answer: meniscus is concave- A. ionic crystals
- B. covalent crystals
- C. molecular crystals
- D. metallic crystals
Explanation: Cleavage is the tendency of a crystal to break along specific planes of weakness, resulting in smooth surfaces.
Correct answer: metallic crystals- A. lo2w temperature and low pressure
- B. high temperature and high pressure
- C. high temperature and low pressure
- D. low temperature and high pressure
Explanation: Gases are considered ideal under certain conditions, such as low pressure and high temperature.
Correct answer: high temperature and high pressure- A. gas molecules do not attract each other at very low temperature
- B. all of the gases cannot be liquefied
- C. increase in pressure will not decrease the intermolecular distance
- D. actual volume of a gas is not negligible at very high pressure
Explanation: True. At very high pressures, the actual volume of a gas is not negligible, and deviations from ideal behavior are observed.
Correct answer: actual volume of a gas is not negligible at very high pressure- A. dipole moment of PH3 is greater than that of SiH4
- B. PH3 has greater molecular size
- C. Molecular weight of SiH4 is less than that of PH3
- D. Actually the boiling of SiH4 is greater than that of PH3
Explanation: The boiling point of a substance is influenced by its intermolecular forces.
Correct answer: dipole moment of PH3 is greater than that of SiH4- A. HF
- B. HCI
- C. Br2
- D. HBr
Explanation: HF (hydrogen fluoride) has the highest boiling point. HF molecules exhibit hydrogen bonding, which is a relatively strong intermolecular…
Correct answer: HF