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ICSE Class 7 Chemistry Question 4 of 16

Metals and Non-metals — Question 2

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Question 2

Distinguish between the physical properties of metals and non-metals with reference to —

(a) lustre

(b) malleability

(c) ductility

(d) tensile strength

(e) sonority

(f) conduction of heat and electricity

(g) melting and boiling point

(h) density

Answer
S.
No.		PropertiesMetalsNon-metals
(a)LustreShows brightnessShows no brightness
(b)MalleabilityCan be beaten into sheetsCannot be beaten into sheets.
(c)DuctilityCan be drawn into wiresCannot be drawn into wires.
(d)Tensile strengthHave high tensile strengthHave low tensile strength
(e)SonorityProduce sound when struckDo not produce sound when struck
(f)Conduction of heat and electricityCan conduct heat and electricityPoor or non-conductors of heat and electricity
(g)Melting and boiling pointHave high melting and boiling pointHave low melting and boiling point
(h)DensityHave high densityHave low density

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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