Free Periodic Properties and Trends MCQs with Answers
606 Periodic Properties and Trends MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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606 questions · page 8 of 31
- A. Ionization potential
- B. Electronegativity
- C. Electron affinity
- D. Activation energy
Explanation: Ionization potential, or ionization energy, is the energy required to remove an electron from an isolated gaseous atom.
Correct answer: Ionization potential- A. Increases
- B. Decreases
- C. Remain same
- D. First decreases then increases
Explanation: Atomic radius generally decreases from left to right across a period because the nuclear charge increases while added electrons enter the…
Correct answer: Decreases- A. Ionization energy
- B. Electron affinity
- C. Electro negativity
- D. Atomic size
Explanation: Electronegativity is a relative scale for an atom’s tendency to attract bonding electrons, so it is not an absolute measurable property.
Correct answer: Electro negativity- A. Generally increases from left to right in a period
- B. Does not change in a period
- C. Increase from top to bottom in a group
- D. Does not change in a group
Explanation: Ionization energy generally increases from left to right across a period because effective nuclear charge increases and the outer electron…
Correct answer: Generally increases from left to right in a period- A. Mg > Sr
- B. Ba > Mg
- C. Lu > Ce
- D. CI > 1
Explanation: Atomic size generally increases down a group because additional electron shells are added.
Correct answer: Ba > Mg- A. White
- B. Redox potential
- C. Black
- D. Violet
Explanation: White phosphorus exists as discrete P4 molecules with considerable ring strain, making it chemically more reactive than the polymeric red…
Correct answer: White- A. Aluminium
- B. Sodium
- C. Carbon
- D. Sulphur
Explanation: Sodium is a metal, so its delocalised electrons allow it to conduct electricity, and its melting point is about 97.8 °C, just below 100…
Correct answer: Sodium- A. H2SO4
- B. HNO3
- C. both A and B
- D. none of the above
Explanation: Sulfur dioxide and nitrogen oxides dissolve in atmospheric water and form sulfuric acid, H2SO4, and nitric acid, HNO3, respectively.
Correct answer: both A and B- A. B
- B. C
- C. N
- D. O
Explanation: Nitrogen has the greatest first ionization energy among B, C, N and O because its 2p3 configuration has three singly occupied p orbitals…
Correct answer: N- A. aluminium can be recycled
- B. aluminium has very low density
- C. aluminium is the most abundant metal in the earth crust
- D. aluminium is resistant to corrosion by organic acids.Chemistry
Explanation: Aluminium rapidly forms a thin, adherent aluminium oxide film that protects the metal from further corrosion, making it suitable for…
Correct answer: aluminium is resistant to corrosion by organic acids.Chemistry- A. Carbon
- B. Arsenic
- C. Nitrogen
- D. Sulphur
Explanation: Carbon, arsenic and sulphur exist in different structural forms called allotropes, but nitrogen is normally found as N2 and is not…
Correct answer: Nitrogen- A. IIIA group
- B. IVA group
- C. VA group
- D. VIA group
Explanation: Across a short period, melting and boiling points generally rise as bonding becomes stronger, reaching a maximum at Group IVA because…
Correct answer: IVA group153. Which of the elements do not fall in stair case of the modern periodic table__________________?
- A. Si
- B. As
- C. Te
- D. None of the above
Explanation: Silicon, arsenic and tellurium all lie on or form part of the staircase boundary between metals and non-metals in the modern periodic…
Correct answer: None of the above- A. Uni-negative
- B. Uni-positive
- C. Di-negative
- D. Di-positive
Explanation: Formation of a uni-negative ion involves adding one electron, and the first electron affinity of an atom is generally exothermic because…
Correct answer: Uni-negative- A. Relative abundance
- B. Average mass of element
- C. Number of isotopes
- D. Relative isotopic mass
Explanation: In a mass spectrum, isotopes of an element produce separate signals at different mass-to-charge values, so the number of peaks generally…
Correct answer: Number of isotopes- A. Atomic number
- B. Relative abundance
- C. Electronic configuration
- D. All of the above
Explanation: A mass spectrometer separates ions according to their mass-to-charge ratios and records their intensities, allowing the mass numbers and…
Correct answer: Relative abundance- A. 0.2m
- B. 0.2mm
- C. 0.2nm
- D. 0.2pm
Explanation: An atomic diameter is typically about 0.1 to 0.3 nm, so 0.2 nm is the appropriate order of magnitude.
Correct answer: 0.2nm- A. Decreasing ionization energy
- B. Having no effect on ionization energy
- C. Increasing ionization energy
- D. Increasing electronegativity
Explanation: The shielding effect of inner electrons causes a decrease in attraction between the nucleus and the outer electrons of the atom.
Correct answer: Decreasing ionization energy- A. HF
- B. HI
- C. HBr
- D. HCl
Explanation: Reducing power refers to the ability of a substance to reduce another substance by donating electrons.
Correct answer: HI- A. HI < HBr < HCl < HF
- B. CH4 < NH3 < H2O < HF
- C. Both of the above options
- D. Cannot be determined
Explanation: HI < HBr < HCl < HF is wrong. HI is the most acidic of all because iodine is the least electronegative among all halogen in the choices.
Correct answer: CH4 < NH3 < H2O < HF