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ICSE Class 7 Chemistry Question 5 of 16

Metals and Non-metals — Question 4

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Question 4

With reference to the following metals state their – use in daily life

Metals:

(a) copper

(b) iron

(c) aluminium

(d) magnesium

(e) zinc

(f) lead

(g) silver

Answer

(a) Copper is used in :

  • making electrical cables
  • making utensils

(b) Iron is used in :

  • construction of bridges
  • making utensils, surgical instruments (in the form of stainless steel)

(c) Aluminium is used in :

  • making utensils
  • packaging

(d) Magnesium is used in :

  • fireworks
  • for making alloys called magnalium and duralumin.

(e) Zinc is used in :

  • galvanization
  • dry cells.

(f) Lead is used in:

  • flexible pipes
  • tips of bullets

(e) Silver is used in :

  • making jewellery and coins
  • making thin sheets to decorate sweets

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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