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 39 of 68
- A. The oxide layer exposes the metal to Atmospheric attack
- B. The oxide layer increases the reactivity of metal
- C. The oxide layer protects the metal from further atmospheric attack
- D. The oxide layer gives the metal a shiny silvery appearance
Explanation: The oxide layer can not react with air, and makes a physical barrier between air and metal.
Correct answer: The oxide layer protects the metal from further atmospheric attack- A. Lubricant
- B. Solvent
- C. Oxidant
- D. Plastic
Explanation: Carbon tetrachloride (CCl4) is used as a solvent in industries.
Correct answer: Solvent- A. MgO
- B. CaO
- C. BaO
- D. SrO
Explanation: Solubility of alkaline earth metal oxides in water increases as we move from top to bottom because lattice energy decreases faster than…
Correct answer: MgO- A. Amphoteric
- B. Neutral
- C. Acidic
- D. Basic
Explanation: The nature of an aqueous solution of ammonia (NH3) is basic. This is because ammonia can accept a proton from water, forming ammonium…
Correct answer: Basic- A. Atoms of II-A elements have smaller size
- B. II-A elements are more reactive
- C. Atoms of II-A elements provide two binding electrons
- D. I-A elements have smaller atomic radius
Explanation: Metallic character as well as melting and boiling increase until period number three because the number of free electrons available for…
Correct answer: Atoms of II-A elements provide two binding electrons- A. 72 pm
- B. 95 pm
- C. 136 pm
- D. 157 pm
Explanation: The atomic radius of fluorine is 72pm, but when an electron is added, the affective nuclear charge decreases so the ionic radius of an…
Correct answer: 136 pm- A. 500 °C
- B. 200 °C
- C. -10 °C
- D. 15°C
Explanation: Reactant is present in aqua state (liquid) for the given options it is only possible at 15 degrees
Correct answer: 15°C- A. Cl2
- B. Br2
- C. I2
- D. F2
Explanation: The correct answer is I2. Among the halogen molecules, iodine (I2) has the weakest bond due to its large atomic size, which leads to…
Correct answer: I2- A. Sulphur (III) oxide
- B. Sulphur dioxide
- C. Iron pyrite
- D. Disulphur dichloride
Explanation: An anhydride is a compound that, when combined with water, forms an acid or base.When SO₂ reacts with water, it forms sulfurous acid…
Correct answer: Sulphur (III) oxide- A. Strong electronegativity
- B. Strong attractive forces
- C. Increment in size
- D. High Ionization Energy
Explanation: Generally the melting point of the metals decreases down the group. This is because as the metal ions get larger the distance between the…
Correct answer: Increment in size- A. Addition of a new shell
- B. Increase in nuclear charge
- C. High Ionization Energy
- D. Decrease in nuclear charge
Explanation: Across a period, effective nuclear charge increases as electron shielding remains constant.
Correct answer: Increase in nuclear charge- A. Krypton
- B. Argon
- C. Helium
- D. Neon
Explanation: Argon gas is an inert gas used in electric bulbs to prevent corrosion of its tungsten filament.
Correct answer: Argon- A. HClaq
- B. KOHaq
- C. Steam
- D. SO3
Explanation: SiO2 is an acidic oxide and reacts with strong bases. Among the given options, it will react with hot, concentrated KOH(aq) due to the…
Correct answer: KOHaq- A. Ionic bond
- B. Covalent bond
- C. Co-ordinate covalent bond
- D. Metallic bond
Explanation: The inert pair effect is the effect of the s-orbitals in which they do not participate to make bonds with other molecules because the…
Correct answer: Ionic bond- A. HI
- B. HF
- C. HBr
- D. All of the above
Explanation: HI is the strongest reducing agent. The compounds having low dissociation energy are a stronger reducing agent than the others having high…
Correct answer: HI- A. Ca(NO3)2 solution
- B. Ba(NO3)2 solution
- C. K2CO3 solution
- D. All turned milky
Explanation: When sulfuric acid is added to calcium nitrate, calcium sulfate is produced, which is slightly soluble and often forms a fine precipitate…
Correct answer: Ca(NO3)2 solution- A. NO
- B. 𝑆𝑂3
- C. 𝑁𝑂−3
- D. 𝑁𝑂2
Explanation: Nitrogen dioxide absorbs radiation in the ultraviolet (UV) and visible (vis) regions due to the electron transitions within the nitrogen…
Correct answer: 𝑁𝑂2- A. Peroxide
- B. Super oxide
- C. Both contain equal quantity
- D. None of the above
Explanation: Potassium form normal oxide ( in which oxygen has oxidation state -2) K2O2.
Correct answer: Super oxide- A. Mg (OH)2
- B. AI(OH)3
- C. Si (OH)4
- D. None of the above
Explanation: The compound where hydrogen is attached to the highly electronegative element is considered to be most acidic.
Correct answer: Si (OH)4- A. CCI4
- B. SiCl4
- C. CH4
- D. None of the above
Explanation: Silicon can be hydrolysed by water because the silicon atom of silicon tetrachloride has energetically suitable vacant d-orbitals.
Correct answer: SiCl4