Free s-Block and p-Block Elements MCQs with Answers

• A. Graphite
• B. Copper
• C. Molten sodium chloride
• D. Mercury Electrical conductivity in materials can occur through two main mechanisms:Electron movement: This is typical for metals and graphite,where the delocalized electrons can freely move and carry the current.Ion movement: This occurs in molten salts and solutions,where charged ions migrate under the influence of an electric field.

Explanation: Electrical conductivity in materials can occur through two main mechanisms:Electron movement: This is typical for metals and…

• A. Na2CO3
• B. K2CO3
• C. NaHCO3
• D. CaCO3

Explanation: Sodium and potassium carbonates readily dissolve in water due to their strong ionic bonds and high hydration energy.Sodium bicarbonate has…

• A. Absorbs moisture and remains solid
• B. Absorbs moisture and turns into liquid
• C. Loses water of crystallization
• D. Increases the number of water of crystallization.

Explanation: Deliquescence is the absorption of moisture from the air by a solid until it dissolves in the absorbed water and forms a solution.In…

• A. water
• B. HCl
• C. Na+
• D. NaCl

Explanation: This is the correct answer. In a diaphragm cell, the reduction of water at the cathode is an undesirable side reaction.

• A. Hydroxide ion reach to anode
• B. Cathode to decay
• C. Chlorine gas to mix
• D. All of the above

Explanation: The higher brine level in the anode compartment creates a hydrostatic pressure that opposes the migration of hydroxide ions (OH-) towards…

• A. Smaller electronegativity of alkali metals
• B. Smaller ionic radius of these metal
• C. De-excitation of electrons from higher energy levels to low energy level
• D. Excitation of electrons from low energy levels to higher energy levels.

Explanation: When these metals are heated, the thermal energy excites electrons from lower energy levels to higher energy levels in their atomic…

• A. high first ionization potential
• B. high second ionization potential
• C. high ionic radius
• D. high electronegativity

Explanation: Removing the second electron from Na+ to form Na2+ requires significantly more energy.

• A. KCl
• B. KCI.MgCl2.6H20
• C. Na2BrO7.10H2O
• D. CaCO3.MgCO3

Explanation: KCl: While potassium chloride (KCl) is a common compound, it is not carnalite.Na2BrO7.10H2O: This is the formula for sodium bromate…

• A. being a block elements
• B. inert gas configuration
• C. ns1 electronic configuration
• D. being metal

Explanation: The correct option for why the second ionization potential of alkali metals is very high is:(b) inert gas configurationsHere's why:Being…

• A. Al+3
• B. Cs+
• C. Ba+
• D. Mg+2

Explanation: The ion with the maximum value of heat of hydration among your options is:(a) Al+3Here's why:Heat of hydration: This refers to the energy…

• A. Sb (Antimony)
• B. N (Nitrogen)
• C. As (Arsenic)
• D. P (Phosphorus)

Explanation: Nitrogen is a nonmetal and is known to have a high electronegativity. It tends to attract electrons strongly in chemical bonds, making it…

• A. Reaction is exothermic
• B. It is insoluble in water
• C. Dilute acid is produced
• D. All of the above

Explanation: When sulfur trioxide (SO3) reacts with water, it forms sulfuric acid (H2SO4).

• A. Coloured solid
• B. Brittle
• C. Hard
• D. All of the above

Explanation: Quartz is a colorless and transparent mineral in its pure form. It is not a colored solid.

• A. White
• B. Red phosphorus
• C. Black phosphorus
• D. Violet phosphorus

Explanation: White phosphorus is the most toxic and reactive allotrope of phosphorus.

• A. FeSO4.NO
• B. FeSO4.NO2
• C. FeSO4.NO3
• D. PCl5

Explanation: Formation of the Brown Ring:Reaction between ferrous sulfate (FeSO4) and nitrate ions (NO3-):2FeSO4 + 2HNO3 → 2Fe(NO3)2 + H2SO4 +…

• A. P2O3 (diphosphorus trioxide)
• B. P2O5 (diphosphorus pentoxide)
• C. H3PO3 (phosphorous acid)
• D. All of the same smell

Explanation: P2O3 has a characteristic garlic-like odor due to the presence of phosphorus hydrides (phosphines) within its structure.

• A. Iron (Fe)
• B. Aluminum (Al)
• C. Chromium (Cr)
• D. All of the above

Explanation: Passivity: This refers to a phenomenon where a metal becomes resistant to further chemical attack under specific conditions.

• A. White phosphorus
• B. Black phosphorus is the most stable allotropic form of phosphorus.
• C. (c) Red phosphorus
• D. Violet phosphorus

Explanation: Reasons for stability:It has a layered structure with strong covalent bonds within each layer and weaker van der Waals forces between…

• A. ZnS (zinc sulfide)
• B. PbS (lead sulfide)
• C. HgS (mercury sulfide)
• D. (d) FeS (iron sulfide)

Explanation: Cinnabar is the most common ore of mercury and has a bright red color due to its chemical composition.

• A. N2O3 (dinitrogen trioxide)
• B. NO3- (nitrate ion)
• C. NO (nitric oxide)
• D. N2O (nitrous oxide)

Explanation: Brown ring test: This is a qualitative test to detect the presence of nitrate ions (NO3-) in a solution.