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 38 of 68
- A. Na, H2, NaOH, Zn
- B. K, H2, KOH, Al
- C. Ca, H2, Ca(OH)2, Sn
- D. CaC2, C2H2, Ca(OH)2
Explanation: The golden yellow flame test identifies A as Sodium (Na). Na reacts with water to produce H₂ gas (B) and NaOH solution (C).
Correct answer: Na, H2, NaOH, Zn- A. Na+ and K+
- B. Ca2+ and Mg2+
- C. Ca2+ and K+
- D. Ca2+ and Na+
Explanation: Hardness in water is primarily caused by the presence of dissolved divalent cations, specifically calcium (Ca²⁺) and magnesium (Mg²⁺)…
Correct answer: Ca2+ and Mg2+- A. Be(OH)2
- B. Mg(OH)2
- C. B(OH)3
- D. Al(OH)3
Explanation: Boric acid, B(OH)₃, is a weak Lewis acid, accepting an OH⁻ ion from water rather than donating a proton.
Correct answer: B(OH)3- A. Reduce the silver bromide grains to metallic silver
- B. Convert the metallic silver to silver salt
- C. Remove undecomposed AgBr as soluble silver thiosulphate complex
- D. Remove reduced silver
Explanation: In the photographic fixing process, sodium thiosulfate (hypo) is used to remove the unexposed and undeveloped silver bromide (AgBr) from…
Correct answer: Remove undecomposed AgBr as soluble silver thiosulphate complex- A. Ammoniated complex cation
- B. Ammoniated electrons
- C. d-d transition
- D. Both (a) & (b)
Explanation: When alkali or alkaline earth metals dissolve in liquid ammonia, they release their valence electrons, which become solvated by the…
Correct answer: Ammoniated electrons- A. Be²⁺ < Mg²⁺ < Ca²⁺ < Sr²⁺ < Ba²⁺
- B. Ba²⁺ < Sr²⁺ < Ca²⁺ < Mg²⁺ < Be²⁺
- C. Sr²⁺ < Ba²⁺ < Ca²⁺ < Mg²⁺ < Be²⁺
- D. Ba²⁺ < Sr²⁺ < Mg²⁺ < Ca²⁺ < Be²⁺
Explanation: Hydration energy is the energy released when ions are hydrated. It is directly proportional to the charge density (charge/radius ratio) of…
Correct answer: Ba²⁺ < Sr²⁺ < Ca²⁺ < Mg²⁺ < Be²⁺- A. Ionization energy
- B. Solubility of their hydroxides
- C. Solubility of their sulphate
- D. Electronegativity
Explanation: As you move down Group 2, the solubility of the hydroxides, M(OH)₂, generally increases.
Correct answer: Solubility of their hydroxides- A. Na2CO3
- B. CaCO3
- C. Ca(HCO3)2
- D. NaHCO3
Explanation: The reactions are CaCO₃(s) → CaO(s) + CO₂(g) (X → residue + gas); CaO(s) + H₂O → Ca(OH)₂(aq) (Y); Ca(OH)₂(aq) + CO₂ → CaCO₃(s) (Z, which…
Correct answer: CaCO3- A. H2
- B. Na
- C. CO2
- D. O2
Explanation: Brine is a highly concentrated solution of NaCl. Cathode is where reduction takes place and oxidation takes place on anode.
Correct answer: H2750. In Diaphragm Cell, level of brine in the anode compartment is kept slightly higher which prevents:
- A. Hydroxide ions to reach the anode
- B. Chlorine gas to mix
- C. Cathode to decay
- D. All of the above
Explanation: Option A is correct as that makes sure that the flow of liquid is always from "left to right" - preventing any of the sodium hydroxide…
Correct answer: Hydroxide ions to reach the anode- A. B & Al
- B. Ca & Mg
- C. Si & Al
- D. All
Explanation: The nine most common elements in the Earth's crust are roughly 46% oxygen, 28% silicon, 8.3% aluminium, 6.9% iron, 2.4% calcium, 2.5%…
Correct answer: Si & Al- A. Size of atoms
- B. Nuclear Charge
- C. Number of shells
- D. All of these options are correct
Explanation: Option D is correct since all of the options mention the correct reasons for the ionization energy trend and all three reasons have to be…
Correct answer: All of these options are correct- A. Sodium sulfate
- B. Potassium sulfate
- C. Zinc sulfate
- D. Barium sulphate
Explanation: Option D is correct since barium sulfate is an insoluble white solid with a low solubility product.
Correct answer: Barium sulphate- A. Simple ions.
- B. Strong anions.
- C. Double salts.
- D. Complex ions.
Explanation: When a compound of a transition element is dissolved in a solution of salt, it will form complex ions.
Correct answer: Complex ions.- A. Ionisation state
- B. Oxidation state
- C. Electronic configuration
- D. Formation of complexes
Explanation: Both lanthanides and actinides have similar electronic configurations. They both have their valence electrons in f-orbitals, which are…
Correct answer: Electronic configuration- A. Being s-block elements
- B. Inert gas configurations
- C. Ns1 electronic configuration
- D. Being metals
Explanation: Second ionization energy can be defined as the removal of one mole of electron from the one mole of monovalent gaseous cation of the…
Correct answer: Inert gas configurations- A. They are more reactive.
- B. They have greater atomic radii.
- C. They have smaller atomic sizes.
- D. All
Explanation: Correct option is C. Alkaline earth metals have smaller atomic sizes as compared to alkali metals so electrons of outermost shells of…
Correct answer: They have smaller atomic sizes.- A. HCO3-
- B. NaOH
- C. KOH
- D. CsOH
Explanation: lonic character, melting point, boiling point, reactivity, thermal stability and solubility in water increase from Li to Cs due to…
Correct answer: CsOH- A. Solid form
- B. Molten form
- C. Aqueous form
- D. Both Options B and C are correct
Explanation: Ionic salts of alkali metals can conduct electricity when they are in the aqueous or molten form.
Correct answer: Both Options B and C are correct- A. A
- B. B
- C. C
- D. D
Explanation: When heated, alkaline earth metal hydroxides undergo thermal decomposition to produce the corresponding metal oxide and water.
Correct answer: A