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NCERT Solutions › Chemistry › Chapter 3

Chapter 3: Classification of Elements

NCERT Solutions for CBSE Class 10 Chemistry — 8 solved questions with detailed explanations.

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Solved Questions

Q1. The most electronegative element is:

Difficulty: Easy · Topic: Electronegativity

Solution

Fluorine has the highest electronegativity (3.98 on Pauling scale) of all elements.

Q2. Electron affinity is highest for:

Difficulty: Easy · Topic: Classification of Elements

Solution

Chlorine.

Q3. Atomic radius generally decreases along:

Difficulty: Easy · Topic: Classification of Elements

Solution

a period (left to right).

Q4. Metallic character increases down:

Difficulty: Easy · Topic: Classification of Elements

Solution

a group.

Q5. Elements with completely filled d-orbitals are:

Difficulty: Easy · Topic: Classification of Elements

Solution

Zn, Cd, Hg.

Q6. Lanthanoids are elements with atomic numbers:

Difficulty: Easy · Topic: Classification of Elements

Solution

57-71.

Q7. The element with atomic number 35 belongs to:

Difficulty: Easy-Medium · Topic: Periodic Table

Solution

Z=35 is Bromine. Config: [Ar]3d¹⁰ 4s² 4p⁵. Group 17 (halogens), Period 4.

Q8. Ionization enthalpy generally increases along a period because:

Difficulty: Easy-Medium · Topic: Periodic Trends

Solution

Along a period, nuclear charge increases while shielding remains similar, so more energy needed to remove electron.

Other Chapters in Chemistry

Ch 1: Some Basic ConceptsCh 2: Structure of AtomCh 4: Chemical BondingCh 5: States of MatterCh 6: ThermodynamicsCh 7: EquilibriumCh 8: Redox ReactionsCh 9: HydrogenCh 10: s-Block ElementsCh 11: p-Block ElementsCh 12: Organic ChemistryCh 13: HydrocarbonsCh 14: Environmental Chemistry

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