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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1,359 questions · page 43 of 68
- A. ns²np⁵
- B. ns²np⁶
- C. ns¹np⁵
- D. ns²np³
Explanation: ns²np⁶ - Correct. Halide ions gain one electron to achieve a full octet, resulting in this configuration.
Correct answer: ns²np⁶- A. Have powerful reducing agents
- B. Have positive reduction potential
- C. Cannot displace H₂ from dilute acids
- D. Lies below SHE in electrochemical series
Explanation: Have powerful reducing agents - Incorrect. Coinage metals (Cu, Ag, Au) are not strong reducing agents; they have low reactivity and tend…
Correct answer: Have powerful reducing agents- A. K2CrO4
- B. MnO2
- C. K2Cr2O4
- D. KMnO4
- E. O2
Explanation: The correct answer is option D: KMnO4. When potassium permanganate (KMnO4) is oxidized by chlorine gas (Cl2), the product obtained is…
Correct answer: KMnO4- A. No. of positron
- B. No. of neutron
- C. Nuclear charge
- D. No. of electron
- E. Atomic size
Explanation: The correct answer is option (c): Nuclear charge. Ionization energy is the energy required to remove an electron from an atom or ion in…
Correct answer: Nuclear charge- A. Na
- B. K
- C. Rb
- D. Li
Explanation: Sodium, potassium and rubidium are all in the same group, but sodium is larger than lithium, potassium is larger than sodium and rubidium…
Correct answer: Li- A. LiCl and CsCI
- B. NaCl and LiCI
- C. CsCI and NaCl
- D. CsCI and BeCl2
Explanation: To determine the compounds with the greatest and the least ionic character, we need to consider the electronegativity difference between…
Correct answer: CsCI and BeCl2- A. Aluminum is electron rich
- B. Aluminum is having lone pair of electron
- C. Aluminum donates lone Pair to form bridge
- D. Aluminum forms coordinate bonds with chlorine to complete Its octet
Explanation: The dimer of aluminum chloride is formed through the formation of coordinate bonds.
Correct answer: Aluminum forms coordinate bonds with chlorine to complete Its octet- A. I B
- B. VII A
- C. IV A
- D. VI A
Explanation: Group IV-A of the periodic table, also known as Group 14, contains elements that include non-metals, metalloids, and metals.
Correct answer: IV A- A. BeSO4
- B. BaSO4
- C. MgSO4
- D. CaSO4
Explanation: BaSO4 (barium sulfate) is insoluble in water. When BaSO4 is added to water, it does not readily dissolve and remains as a solid precipitate.
Correct answer: BaSO4- A. Beryllium
- B. Magnesium
- C. Calcium
- D. Strontium
Explanation: The correct answer is a) Beryllium. Among the given alkaline earth metals, beryllium is the exception that does not display a white color…
Correct answer: Beryllium- A. Molecular crystals
- B. Ionic crystals
- C. Covalent crystals
- D. Metallic crystal
Explanation: Iodine is a molecular crystal due to its non-polar nature.
Correct answer: Molecular crystals- A. Shielding
- B. Atomic number
- C. proton number
- D. Ionization energy
Explanation: Ionization energy always decreases down the group because atomic size increases which weakens the force of attraction between the nucleus…
Correct answer: Ionization energy- A. Na
- B. K
- C. Li
- D. Cs
Explanation: Na forms normal oxide during deficiency of oxygen and peroxide when provided with excess of oxygen.
Correct answer: Na- A. Benzene
- B. Toulene
- C. Ethylbenzene
- D. Xylene
Explanation: Benzene (C6H6) is a stable aromatic hydrocarbon. It consists of a ring of six carbon atoms bonded together with alternating single and…
Correct answer: Benzene- A. HF > HCL> HBr > HI
- B. HBr > HCl > HI
- C. HCl> HBr >HI > HF
- D. HI> HBr >HCl > HF
Explanation: The correct option is D: HI > HBr > HCl > HF. It correctly identifies iodine (I) as the most reactive halogen, followed by bromine (Br)…
Correct answer: HI> HBr >HCl > HF- A. IA
- B. VA
- C. VIA
- D. VIIA
Explanation: Group 1-A elements being the most electropositive easily loose electrons that's why they are called reducing agents and alkali metals.
Correct answer: IA- A. 1s², 2s², 2p²
- B. 1s², 2s², 2p⁴
- C. 1s², 2s², 2p⁴, 3s²
- D. 1s², 2s², 2p⁴, 3s², 3p⁴
Explanation: The electronic configuration of carbon is: C = 1s², 2s², 2p²So, only option A is correct.
Correct answer: 1s², 2s², 2p²- A. NaOH
- B. LiOH
- C. KOH
- D. RbOH
Explanation: Except lithium hydroxide,all the alkali metal hydroxides are highly soluble in water.
Correct answer: LiOH- A. Blue
- B. Violet
- C. Yellow
- D. White
Explanation: The color of the flame produced burning magnesium metal is a bright white.
Correct answer: White- A. Acetaldehyde
- B. Acetic acid
- C. Acetone
- D. Ethane
Explanation: When calcium acetate is dry-heated, it undergoes a decarboxylation reaction, resulting in the formation of acetone.The reaction can be…
Correct answer: Acetone