Metals and Non-metals: Chapter 3 Class IX
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Questions and Answers

Which physical property of metals makes gallium and caesium exceptions to the general rule that metals exist as solids at room temperature?

  • High density
  • High melting point
  • Low melting point (correct)
  • Brittle texture

    • What will be the action of sodium (Na) on water?

  • It will have no reaction with water.
  • It will form a layer of oxide on the surface.
  • It will react violently, producing hydrogen gas and sodium hydroxide. (correct)
  • It will produce only hydrogen gas.

    • Which allotrope of carbon is a conductor of electricity, contrary to the typical property of non-metals?

  • Graphite (correct)
  • Diamond
  • Buckminsterfullerene
  • Fullerene

    • Why are platinum, gold, and silver used to make jewellery?

    <p>Because they are very malleable and do not corrode easily.</p> Signup and view all the answers

    What unique property of iodine makes it stand out as a non-metal despite its lustrous appearance?

    <p>Lustrous appearance</p> Signup and view all the answers

    What type of oxides are formed when non-metals combine with oxygen?

    <p>Acidic oxides</p> Signup and view all the answers

    What property allows alkali metals like lithium, sodium, and potassium to be cut with a knife?

    <p>Softness</p> Signup and view all the answers

    Why are sodium, potassium, and lithium stored under oil?

    <p>To prevent them from reacting with water or air.</p> Signup and view all the answers

    In the reactivity series of metals, which metal would react the most vigorously with water?

    <p>Sodium</p> Signup and view all the answers

    Why is aluminium used to make utensils for cooking despite being a highly reactive metal?

    <p>Because it forms a protective oxide layer that prevents further reactions.</p> Signup and view all the answers

    Which type of metal oxide layer protects the underlying metal from further corrosion?

    <p>Thick and flaky oxide layer</p> Signup and view all the answers

    Why are carbonate and sulphide ores usually converted into oxides during the extraction process?

    <p>To stabilize the ores and prevent them from reacting further.</p> Signup and view all the answers

    Which property of metals is described as having a shining surface?

    <p>Metallic lustre</p> Signup and view all the answers

    What is the purpose of holding a piece of sodium metal with tongs and drying it before cutting it with a knife?

    <p>To avoid a violent reaction due to the high reactivity of sodium with air</p> Signup and view all the answers

    Which metal would be the easiest to cut with a sharp knife based on the activity described?

    <p>Copper</p> Signup and view all the answers

    Which process involves rubbing metal samples with sandpaper to observe changes in appearance?

    <p>Cleaning for metallic lustre</p> Signup and view all the answers

    Which metal is placed higher in the reactivity series than sodium?

    <p>Magnesium</p> Signup and view all the answers

    'Ductility' is a property of metals that refers to their ability to:

    <p>Form into thin wires without breaking</p> Signup and view all the answers

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