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 12 of 31
- A. Complete
- B. Incomplete
- C. Called Long Period
- D. None of these
Explanation: The 7th period of the periodic table is currently incomplete, as new superheavy elements are still being discovered and added to the…
Correct answer: Incomplete- A. [Ne] 3s2 3p1
- B. [Ne] 3s2 3p3
- C. [Ne] 3s2 3p2
- D. [Ar] 3d10 4s2 4p³
Explanation: The configuration [Ne] 3s²3p³ represents an element with a half-filled p-subshell.
Correct answer: [Ne] 3s2 3p3- A. Fe > Sc > Rb >Br > Te > F > Ca
- B. Ca > Rb > Sc > Fe > Te > Br > F
- C. Rb > Ca > Sc > Fe > Br > Te > F
- D. Rb > Ca > Sc > Fe > Te > Br > F
Explanation: Electropositive character (metallic character) is highest for alkali metals (Rb) and decreases across the periodic table.The general trend…
Correct answer: Rb > Ca > Sc > Fe > Te > Br > F- A. (A) < (B) < (C)
- B. (C) < (B) < (A)
- C. (A) < (C) < (B)
- D. (B) < (A) < (C)
Explanation: In the third period, oxide character changes from ionic to amphoteric to covalent.
Correct answer: (A) < (B) < (C)- A. S²⁻ > Cl⁻ > K⁺ > Ca²⁺
- B. Ca²⁺ > K⁺ > Cl⁻ > S²
- C. Cl⁻ > S²⁻ > Ca²⁺ > K⁺
- D. K⁺ > Cl⁻ > Ca²⁺ > S²⁻
Explanation: For isoelectronic species (those with the same number of electrons), the size decreases as the nuclear charge (number of protons)…
Correct answer: S²⁻ > Cl⁻ > K⁺ > Ca²⁺- A. It is softer than other alkali metals
- B. It is least reactive
- C. It possesses higher melting and boiling points
- D. It forms chloride which is soluble in alcohol
Explanation: Lithium is actually harder than the other alkali metals (it can even scratch glass), while the others are very soft.
Correct answer: It is softer than other alkali metals- A. Gallium and Germanium
- B. Aluminium and Silicon
- C. Iron and Sulphur
- D. Proton and Silicon
Explanation: Dmitri Mendeleev predicted the existence and properties of several undiscovered elements.
Correct answer: Gallium and Germanium228. According to modern periodic law, variations in the properties of elements is related to their:
- A. Atomic weight
- B. Nuclear weight
- C. Atomic numbers
- D. Neutron-proton ratio
Explanation: The Modern Periodic Law states that the physical and chemical properties of the elements are periodic functions of their atomic numbers.
Correct answer: Atomic numbers- A. d-block
- B. f-block
- C. s-block
- D. p-block
Explanation: The electronic configuration shown, [Ar] 3d⁵ 4s¹, is that of Chromium (Cr).
Correct answer: d-block- A. Fe
- B. K
- C. Ba
- D. N
Explanation: Representative elements (or main group elements) are those in the s-block and p-block of the periodic table.
Correct answer: Fe231. Which of the following represents the electronic configuration of the most electropositive element?
- A. [He] 2s1
- B. [Xe] 6s1
- C. [He] 2s2
- D. [Xe] 6s2
Explanation: Electropositivity is the tendency of an atom to lose electrons, and it increases down a group.
Correct answer: [Xe] 6s1- A. 1.36 Å,1.40Å, 1.71 Å
- B. 1.36 Å, 1.71Å, 1.40Å
- C. 1.71 Å, 1.40 Å, 1.36 Å
- D. 1.71Å, 1.36Å, 1.40Å
Explanation: N³⁻, O²⁻, and F⁻ are isoelectronic (all have 10 electrons). For isoelectronic species, the ionic radius decreases as the nuclear charge…
Correct answer: 1.71 Å, 1.40 Å, 1.36 Å- A. Metallic hydrides
- B. Complex hydrides
- C. Polymeric hydrides
- D. Borderline hydrides
Explanation: ZnH₂ does not exist as simple Zn-H units.Instead, it forms a polymeric structure where hydrogen atoms act as bridges between zinc atoms…
Correct answer: Polymeric hydrides- A. 1.60 and 1.60
- B. 0.72 and 1.60
- C. 0.72 and 0.72
- D. None of these
Explanation: The atomic radius of Fluorine is its covalent radius, which is small (~0.72 Å).
Correct answer: 0.72 and 1.60- A. Normal elements
- B. Transition elements
- C. Lanthanides
- D. Actinides
Explanation: The lanthanide series, also known as the lanthanoids, is the block of 14 elements following Lanthanum (Z=57) in the periodic table.
Correct answer: Lanthanides- A. Mg(g) → Mg+(g) + e-
- B. Mg+(g)→ Mg2+(g)+ e-
- C. Na(g)→ Na+ (g)+ e-
- D. Na+(g)→ Na2+(g)+ e-
Explanation: This process represents the second ionization of Sodium. After the first ionization, Na⁺ has a very stable, noble gas electron…
Correct answer: Na+(g)→ Na2+(g)+ e-- A. Li < Na < K < Rb < Cs
- B. Cs < K < Rb < Na < Li
- C. Na < K < Rb < Cs < Li
- D. K < Na < Rb < Cs < Li
Explanation: Reducing power generally increases down the group due to decreasing ionization energy.
Correct answer: Na < K < Rb < Cs < Li- A. It forms a basic oxide
- B. It belongs to Group 2 (IIA)
- C. It belongs to Period 4
- D. It forms an acidic oxide
Explanation: The element with this configuration is Calcium (Ca), an alkaline earth metal. As a metal, it forms a basic oxide (CaO).
Correct answer: It forms an acidic oxide- A. d5, d3, d1, d4 - increasing magnetic moment
- B. MO, M2O3, MO2, M2O5 - decreasing basic strength
- C. Sc, V, Cr, Mn - increasing number of oxidation states
- D. Co2+, Fe3+, Cr3+, Sc3+ - increasing stability
Explanation: Magnetic moment is proportional to the number of unpaired electrons. The number of unpaired electrons for these configurations is 5, 3, 1…
Correct answer: d5, d3, d1, d4 - increasing magnetic moment- A. Na2O > MgO > Al2O3 > CuO
- B. MgO > Al2O3 > CuO > Na2O
- C. Al2O3 > MgO > CuO > Na2O
- D. CuO > Na2O > MgO > Al2O3
Explanation: The basic character of oxides decreases across a period as metallic character decreases.
Correct answer: Na2O > MgO > Al2O3 > CuO