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Metals and Non-metals — Question 12

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Question 6

Give four differences between metals and non-metals with reference to their:

(a) Melting point and boiling point

(b) Conductivity of heat and electricity

(c) Malleability

(d) Solubility in water.

Answer

(a) Metals have high melting point and boiling point whereas non-metals have low melting point and boiling point.

(b) Metals are good conductors of heat and electricity but non-metals are bad conductors of heat and electricity.

(c) Metals are mostly malleable while non-metals are not malleable.

(d) Metals are insoluble in water while non-metals can be soluble or insoluble in water.

ICSE Class VII Chemistry Chapter 5 14 Marks

Metals and Non-Metals — Quick Study Guide

Elements are broadly classified as metals, non-metals, or metalloids based on their physical and chemical properties.

Key Properties

  • Metals: Lustrous, malleable, ductile, sonorous, good conductors, high density
  • Non-metals: Dull, brittle, poor conductors, non-sonorous, low density
  • Metalloids: Properties of both (e.g., Silicon, Germanium)

Chemical Reactions

  • Metal + O2 → Basic oxide (turns red litmus blue)
  • Non-metal + O2 → Acidic oxide (turns blue litmus red)
  • Metal + Acid → Salt + H2

Exam Tips

  • Know all exceptions: Mercury (liquid), Graphite (conducts), Diamond (lustrous), Na/K (soft)
  • Learn the comparison table (8 properties) thoroughly
  • Practice writing equations for metal reactions
  • Know uses of at least 5 metals and 5 non-metals

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