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Chapter 11: p-Block Elements

NCERT Solutions for CBSE Class 10 Chemistry — 9 solved questions with detailed explanations.

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Solved Questions

Q1. The most abundant element in Earth's crust is:

Silicon
Iron
Oxygen
Aluminum

Difficulty: Easy · Topic: Abundance

Solution

Oxygen is the most abundant element in Earth's crust (~46% by mass), followed by silicon (~28%).

Q2. The most reactive halogen is:

Chlorine
Iodine
Bromine
Fluorine

Difficulty: Easy · Topic: p-Block Elements

Solution

Fluorine.

Q3. Noble gases are also called:

active gases
reactive gases
metalloids
inert gases

Difficulty: Easy · Topic: p-Block Elements

Solution

inert gases.

Q4. Diamond is the hardest natural substance because:

ionic bonds
strong covalent bonds in 3D network
van der Waals forces
metallic bonds

Difficulty: Easy · Topic: p-Block Elements

Solution

strong covalent bonds in 3D network.

Q5. Silicones are polymers of:

organosilicon compounds
carbon
silica
silicon metal

Difficulty: Easy · Topic: p-Block Elements

Solution

organosilicon compounds.

Q6. Phosphorus exists as P₄ molecules in:

white phosphorus
black phosphorus
violet phosphorus
red phosphorus

Difficulty: Easy · Topic: p-Block Elements

Solution

white phosphorus.

Q7. Boron shows diagonal relationship with:

Nitrogen
Carbon
Silicon
Aluminium

Difficulty: Easy · Topic: p-Block Elements

Solution

Silicon.

Q8. The allotrope of carbon with sp² hybridization in 2D sheets is:

Diamond
Graphite
Fullerene
Carborundum

Difficulty: Easy-Medium · Topic: Carbon Allotropes

Solution

In graphite, each carbon is sp² hybridized, forming 2D hexagonal sheets with delocalized π electrons.

Q9. The inert pair effect is observed in:

s-block elements
p-block elements
d-block elements
f-block elements

Difficulty: Easy-Medium · Topic: Inert Pair Effect

Solution

Inert pair effect: reluctance of s-electrons to participate in bonding, observed in heavier p-block elements (Tl, Pb, Bi).

Other Chapters in Chemistry

Ch 1: Some Basic Concepts Ch 2: Structure of Atom Ch 3: Classification of Elements Ch 4: Chemical Bonding Ch 5: States of Matter Ch 6: Thermodynamics Ch 7: Equilibrium Ch 8: Redox Reactions Ch 9: Hydrogen Ch 10: s-Block Elements Ch 12: Organic Chemistry Ch 13: Hydrocarbons Ch 14: Environmental Chemistry

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