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 5 of 31
- A. boron
- B. carbon
- C. silicon
- D. tin
Explanation: The inert pair effect becomes stronger down Group 14 because the ns2 electrons are held more tightly and are less available for bonding.
Correct answer: tin- A. Cu
- B. Cr
- C. Ni
- D. A1
Explanation: Copper, chromium and nickel form coloured metal metaborates in the oxidising or reducing parts of a borax bead, giving characteristic bead…
Correct answer: A1- A. Tincal
- B. Boric acid
- C. Calcium carbonate
- D. Colemanite
Explanation: Tincal, or natural borax, occurs in evaporite deposits and dried-up lake beds, including those of Tibet and California.
Correct answer: Tincal- A. Soil porocity
- B. Proper growth of plants
- C. Alkalinity of soil
- D. All
Explanation: Boron is required only in small quantities, but it is essential for proper plant growth, including cell-wall formation and reproductive…
Correct answer: Proper growth of plants- A. decrease
- B. increase
- C. remains constant
- D. first decreases then increases
Explanation: Gallium arsenide is a semiconductor, and increasing temperature supplies more energy for electrons to cross the band gap into the…
Correct answer: increase- A. metal borate
- B. metal meta borate
- C. metal boride
- D. metal silicate
Explanation: In the borax bead test, borax forms a glassy boron oxide medium that reacts with a metal oxide to produce a coloured metal metaborate.
Correct answer: metal meta borate87. Boron is non metal while other elements of IIIA group are metals. This is because______________?
- A. it has small size
- B. it has high nuclear charge
- C. it forms molecular addition compounds
- D. all of the above
Explanation: Boron has a very small atomic size, high ionisation energy and high charge density, so it forms mainly covalent molecular compounds rather…
Correct answer: all of the above- A. As nitrometer
- B. To remove air bubbles from molten metal
- C. To produce alloy
- D. As insulator
Explanation: Aluminium has a strong affinity for both oxygen and nitrogen, so it reacts with dissolved gases in molten metal and helps remove air…
Correct answer: To remove air bubbles from molten metal- A. 26%
- B. 27%
- C. 37%
- D. <2.6%
Explanation: The solubility of orthoboric acid rises sharply with temperature, reaching about 37% at 107°C, compared with 2.6% at 40°C.
Correct answer: 37%- A. Small size
- B. High nuclear charge
- C. Both A and B
- D. No authorized justification yet
Explanation: Boron has a very small atomic size and a high effective nuclear attraction for its valence electrons, giving it high ionisation energy and…
Correct answer: Both A and B- A. high first ionization potential
- B. high second ioniation potential
- C. high ionic radius
- D. high electronegativity
Explanation: After losing one electron, sodium has the stable noble-gas configuration of neon.
Correct answer: high second ioniation potential- A. Sodium and Lithium
- B. Lithium and magnesium
- C. Lithium and beryllium
- D. Boron and Beryllium
Explanation: Lithium and magnesium lie diagonally opposite each other in the periodic table and show similar properties, such as forming nitrides and…
Correct answer: Lithium and magnesium- A. They are more reactive
- B. They have greater atomic radii
- C. They have smaller atomic sizes
- D. All
Explanation: Alkaline-earth atoms have two valence electrons and generally smaller atomic sizes than the corresponding alkali metals in the same…
Correct answer: They have smaller atomic sizes- A. Ca
- B. Cr
- C. Both of the above
- D. None of the above
Explanation: Cesium is an alkali metal and does not have the characteristic diagonal relationship with calcium or chromium; its closest group…
Correct answer: None of the above- A. Mg > Sr
- B. Ba > Mg
- C. Lu > Ce
- D. C1 > I
Explanation: Atomic size generally increases down a group because extra electron shells are added, so barium is larger than magnesium.
Correct answer: Ba > Mg- A. Increase down the group
- B. Decrease down the group
- C. No regular trend
- D. Remain same
Explanation: Metallic character increases down Group 1 because atomic size and shielding increase, making the outer electron easier to remove.
Correct answer: Increase down the group- A. Exothermic
- B. Endothermic
- C. Data is insufficient
- D. Unpredictable
Explanation: Adding a second electron to a uninegative ion is endothermic because the incoming electron is repelled by the already negative ion, so…
Correct answer: Endothermic- A. Nuclear charge
- B. Atomic size
- C. Shielding effect
- D. I.E depends upon all of the above and nature of orbital
Explanation: Ionization energy depends on nuclear charge, atomic size, shielding, and the type of orbital from which the electron is removed, so all…
Correct answer: I.E depends upon all of the above and nature of orbital- A. Ionization energy
- B. Atomic radii
- C. Melting & boiling points
- D. Atomic volume
Explanation: Across a period, melting and boiling points generally rise as stronger metallic or covalent network bonding develops, reaching a maximum…
Correct answer: Melting & boiling points- A. Location of nucleus by Rutherford
- B. Atomic number by Moseley
- C. X-rays by Roentgen
- D. Natural radioactivity by Henry Bacquerel.
Explanation: Moseley showed that elements should be arranged by increasing atomic number rather than atomic mass, leading to the modern periodic law…
Correct answer: Atomic number by Moseley