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 6 of 31
- A. Melting point of elements
- B. Boiling point of elements
- C. Ionization energy of elements
- D. Coordination number of ions
Explanation: Melting point, boiling point, and ionization energy show systematic variation with atomic number and are therefore periodic properties.
Correct answer: Coordination number of ions- A. Boron & Beryllium
- B. Nitrogen & Phosphorous
- C. Magnesium & Aluminium
- D. Gallium & Helium
Explanation: Nitrogen and phosphorus are both in Group 15, with five valence electrons and similar chemical behaviour.
Correct answer: Nitrogen & Phosphorous- A. Same number of electrons in the valence shell
- B. Similar physical state
- C. Remarkable reducing properties
- D. Homovalent (show same valency)
Explanation: Hydrogen and carbon can both act as reducing agents because they combine with oxygen and remove oxygen from some compounds, so the stated…
Correct answer: Remarkable reducing properties- A. less reactive
- B. Zero group elements
- C. Having completely filled valence shell
- D. All
Explanation: Noble gases are very unreactive because their valence shells are completely filled; they were also historically placed in Group 0.
Correct answer: All- A. Hydrogen
- B. Sodium
- C. Copper
- D. Germanium
Explanation: Germanium was not known when Mendeleev proposed his table; he predicted its existence and properties as eka-silicon, and it was discovered…
Correct answer: Germanium- A. Al-Razi
- B. Moseley
- C. Dobereiner
- D. Democritus
Explanation: Democritus proposed an early atomic concept but did not contribute to the construction of the periodic table, which involved later…
Correct answer: Democritus- A. Flrorine
- B. Chlorine
- C. Bromine
- D. Iodine
Explanation: Boiling points of halogens increase from fluorine to iodine because their molecules become larger and more polarizable, so London…
Correct answer: Iodine- A. Metallic character
- B. Electronegativity
- C. Oxidizing power
- D. Tendency to get reduced
Explanation: Metallic character generally increases down a group because atomic size and shielding increase, making the outer electron easier to…
Correct answer: Metallic character- A. Group IA
- B. Group IB
- C. Group VIIA
- D. Group VIII
Explanation: Group IA elements have low ionization energy because they can readily lose their single valence electron, while their electron affinity is…
Correct answer: Group IA- A. Cr
- B. Mn
- C. Sn
- D. O
Explanation: Manganese reaches oxidation state +7 in permanganate, MnO4-, which is higher than chromium's common maximum of +6, tin's +4, and oxygen's…
Correct answer: Mn- A. Increase
- B. Decrease
- C. Remain constant
- D. No regular trend
Explanation: The melting points of halogens increase down Group VIIA because molecular size and polarizability increase, strengthening London…
Correct answer: Increase- A. Atom will lose electron easily
- B. Atom will gain electron easily
- C. Atom may form di-positive ion
- D. The reason is unknown
Explanation: A higher electron affinity means that an atom releases more energy when it accepts an electron, so it has a greater tendency to gain an…
Correct answer: Atom will gain electron easily- A. Increases
- B. Decreases
- C. Can not be predicted
- D. Remains constant
Explanation: Across a period, added electrons enter the same principal shell, while the number of inner-shell electrons remains nearly unchanged, so…
Correct answer: Remains constant- A. Isobars
- B. Isomers
- C. Isotopes
- D. Isotropes
Explanation: Isotopes are atoms of the same element with the same atomic number but different mass numbers, caused by different numbers of neutrons.
Correct answer: Isotopes- A. Alkali metal
- B. Alkaline earth metal
- C. Elements from Li to Ne
- D. Halogens
Explanation: From Li to Ne, electrons are added to the same second shell while nuclear charge increases, so effective nuclear attraction increases and…
Correct answer: Elements from Li to Ne- A. The nature of its oxides
- B. The charge on its ions
- C. The formula of its oxide
- D. Its number of isotopes
Explanation: The periodic-table position can help predict oxide character, common ionic charge, and often oxide formula from valence electrons, but it…
Correct answer: Its number of isotopes117. In modern periodic table all the leements are arranged in ascending order of__________________?
- A. Valency
- B. Atomic mass
- C. Atomic number
- D. Valence electrons
Explanation: The modern periodic table arranges elements in increasing atomic number, which is the number of protons in the nucleus.
Correct answer: Atomic number- A. Same family
- B. Same period
- C. p block elements
- D. Right upper corner
Explanation: Elements in the same family, or vertical group, have similar valence-shell electronic configurations, so they show similar chemical…
Correct answer: Same family- A. Dobereiner
- B. Newland
- C. Mendeleev
- D. Al-Razi
Explanation: Johann Wolfgang Döbereiner introduced the concept of triads, grouping three elements with similar properties in which the atomic mass of…
Correct answer: Dobereiner120. Periodic table provides a basic framework to study elements with respect to their__________________?
- A. Physical properties
- B. Chemical properties
- C. Properties of their compounds
- D. All
Explanation: The periodic table arranges elements so that their physical properties, chemical properties, and the properties of their compounds can be…
Correct answer: All