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.
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- A. Li
- B. Al
- C. Ca
- D. Ba
Explanation: Ionisation energy falls down a group as the outer electron lies further from the nucleus and is better shielded, and barium is the lowest…
Correct answer: Ba- A. 1
- B. 2
- C. 14
- D. 18
Explanation: Group 18 elements have completely filled valence shells, and their atoms exist independently rather than forming ordinary diatomic or…
Correct answer: 18- A. Francium
- B. Caesium
- C. Rubidium
- D. Radium
Explanation: Alkali metals are the Group 1 elements, including francium, caesium and rubidium, each with one valence electron.
Correct answer: Radium- A. 2
- B. 4
- C. 8
- D. 7
Explanation: The modern periodic table is divided into s, p, d, and f blocks according to the subshell receiving the differentiating electron, giving…
Correct answer: 4- A. lanthanides & actinides
- B. s and p block elements
- C. chalcogens and halogens
- D. d and f block elements
Explanation: The d-block transition elements are positioned between the s-block elements on the left and the p-block elements on the right of the…
Correct answer: s and p block elements- A. Cl
- B. F
- C. N
- D. Br
Explanation: Group VIIA, or group 17, contains the halogens fluorine, chlorine and bromine.
Correct answer: N- A. P
- B. K
- C. Po
- D. Pt
Explanation: Potassium has the symbol K, derived from its Latin name kalium, rather than a symbol based directly on the English name.
Correct answer: K- A. increase
- B. decrease
- C. constant
- D. none of these
Explanation: Across a period from left to right, effective nuclear charge generally increases while atomic radius decreases, so the attraction between…
Correct answer: increase- A. 35.5
- B. 17
- C. 15
- D. 21
Explanation: The atomic number, Z, equals the number of protons in an atom. Chlorine has 17 protons, so Z = 17; 35.5 is its approximate relative atomic…
Correct answer: 17- A. Au
- B. Ag
- C. Sv
- D. At
Explanation: Silver has the symbol Ag, derived from its Latin name argentum. Au is gold, while Sv is not an accepted chemical symbol, making Au the…
Correct answer: Ag- A. Helium
- B. Hydrogen
- C. Chlorine
- D. Carbon
Explanation: Hydrogen makes up approximately 70% of the universe by mass because it was formed abundantly in the early universe and is the main element…
Correct answer: Hydrogen- A. Increases
- B. Decreases
- C. Remains Same
- D. None of them
Explanation: Across a period, added electrons enter the same principal shell, so the shielding effect remains nearly constant while nuclear charge…
Correct answer: Remains Same- A. Protium
- B. Deuterium
- C. Tritium
- D. Nichromium
Explanation: Tritium, 3H, contains one proton and two neutrons and is radioactive because its nucleus is unstable.
Correct answer: Tritium- A. Copper sulphate
- B. Barium sulphate
- C. Cobalt sulphate
- D. Nickel sulphate
Explanation: The borax bead test gives characteristic colours mainly with transition-metal ions, such as copper, cobalt and nickel.
Correct answer: Barium sulphate- A. 2.8
- B. 2.2
- C. 3.1
- D. 1.8Chemistry
Explanation: On the Pauling scale, hydrogen has an electronegativity of about 2.2, reflecting its moderate attraction for shared bonding electrons.
Correct answer: 2.2- A. 50%
- B. 60%
- C. 70%
- D. 80%
Explanation: Hydrogen constitutes roughly 70 to 75% of the universe by mass, especially when the composition of stars is considered, so 70% is the…
Correct answer: 70%- A. All the metals are good conductor of electricity
- B. All the metals are good conductor of heat
- C. All the metals form positive ions
- D. All the metals form acidic oxides
Explanation: Metal oxides are not all acidic: many are basic, and some such as aluminium oxide are amphoteric.
Correct answer: All the metals form acidic oxides- A. size of Cl atoms > Cl- ion
- B. size of Na+ ion < Na atom
- C. size of Na atom < Na+ ion
- D. Cl- < Na+
Explanation: A sodium atom loses its outer electron to form Na+, so the ion has fewer electron shells and a smaller radius: Na+ is smaller than Na.
Correct answer: size of Na+ ion < Na atom- A. Bitumen
- B. Bauxite
- C. Metalloids
- D. Ores
Explanation: Metal-bearing rocks from which metals can be extracted economically are called ores.
Correct answer: Ores- A. Electronic shells
- B. Proton shells
- C. Neutron shells
- D. Nucleus
Explanation: Atomic radius increases down a group because each successive element contains an additional occupied electronic shell, placing the outer…
Correct answer: Electronic shells