Free s-Block and p-Block Elements MCQs with Answers
1,359 s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
Last updated
1,359 questions · page 20 of 68
- A. Divalent cations
- B. Trivalent anions
- C. Divalent anions
- D. Trivalent cations
Explanation: A cation is smaller than the parent atom while an anion is bigger than the parent anion.
Correct answer: Trivalent cations- A. Effective nuclear charge
- B. Shells
- C. Electrons
- D. Screening effect
Explanation: As we move down the group, the screening effect, the number of electrons and the number of shells increase.
Correct answer: Effective nuclear charge- A. 40 pm
- B. 53 pm
- C. 37 pm
- D. 120 pm
Explanation: The atomic radius is a measure of the size of an atom. It is the distance from the nucleus to the outermost shell.
Correct answer: 53 pm- A. 152
- B. 153
- C. 154
- D. 155
Explanation: Option A 152 isotopes have not even atomic and mass numbers. Option B It is also wrong because 153 isotopes have not even atomic and mass…
Correct answer: 154- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Oxidising power of halogens decreases down the group. Iodine has the least oxidising power, followed by Br2, Cl2 and then F2.
Correct answer: Option B- A. Atomic radius
- B. Melting point
- C. Number of shells (orbits)
- D. Electrical conductivity
Explanation: Across a period, the atomic number increases, which means the number of protons increases in the nucleus.
Correct answer: Number of shells (orbits)- A. More the electropositivity
- B. More the reducing power
- C. Less the metallic character
- D. Bigger the atomic radius
Explanation: Ionization energy is the energy required to remove an electron from a neutral gaseous atom, and it is a measure of the tendency of an…
Correct answer: Less the metallic character- A. 1
- B. 2
- C. 4
- D. 3
Explanation: Carbon has the highest melting point, due to it having 4 strong covalent bonds which require a lot of energy to break.
Correct answer: 3- A. Decrease in atomic radius from 'Si' to 'P'
- B. Change in bonding and structure of two elements
- C. Different universities of two elements
- D. Increase in electron density from 'Si' to 'P'
Explanation: From Si onwards, the bonding and structure of the element change from covalent to weak van der Waal forces that cause the decrease in…
Correct answer: Change in bonding and structure of two elements- A. Melting and boiling points first decrease then increase
- B. Melting and boiling points increase gradually
- C. Melting and boiling points first increase then decrease
- D. Melting and boiling points decrease gradually
Explanation: In general, the melting point increases across a period up to group 14 and then decreases from group 14 to group 18.From sodium to…
Correct answer: Melting and boiling points first increase then decrease- A. Increase in number of electrons in valence shells
- B. Increase in number of protons in the nucleus
- C. Decrease in number of shells
- D. Increase in number of shells
Explanation: Along a period, the number of shells increases (electrons are added to the same principal energy level), and the atomic number increases.
Correct answer: Increase in number of protons in the nucleus- A. The s-block elements
- B. The p-block elements
- C. The d and f block elements
- D. None of the blocks
Explanation: In the case of d-block elements due to the presence of electrons at d orbitals, is closer to the outermost shell of the metal.
Correct answer: The d and f block elements- A. 18
- B. 8
- C. 32
- D. 10
Explanation: Second and third period are called short periods and contain eight elements.The third period contains eight elements: sodium, magnesium…
Correct answer: 8- A. Shielding effect
- B. Transition effect
- C. Intervening effect
- D. Electronic effect
Explanation: The screening effect is also known as the "shielding effect" If the electron shells are wider in space, the interaction between the…
Correct answer: Shielding effect- A. Electronegativity
- B. Electropositivity
- C. Ionisation energy
- D. electron affinity
Explanation: Ionization energy, also called ionization potential, is the amount of energy required to remove one mol of electron from an isolated atom…
Correct answer: Ionisation energy- A. 18 elements each
- B. 32 elements each
- C. 8 elements each
- D. 14 elements each
Explanation: Fact.The 2nd-period elements: lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon.
Correct answer: 8 elements each- A. s
- B. d
- C. p
- D. f
Explanation: S orbital has only 1 orbital and is defined by letter S.
Correct answer: s- A. V is more reactive than Y
- B. W has more metallic character than Y
- C. Y has a lower melting point than V
- D. Option a and c both are correct
Explanation: the melting points of Group I elements (alkali metals) decrease as you move down the group.
Correct answer: Y has a lower melting point than V- A. V is more reactive than Y
- B. W has more metallic character than V
- C. Y has a lower melting point than V
- D. Z is more reactive than X
Explanation: A. Reactivity for metals increases down the group so V is less reactive than Y which is below V.B.
Correct answer: Y has a lower melting point than V- A. The number of electrons used in bonding
- B. The number of electron shells
- C. The atomic number
- D. The atomic mass
Explanation: The correct answer is Option A: 'The number of electrons used in bonding'.
Correct answer: The number of electrons used in bonding