WAEC Chemistry questions

357 questions with answers and explanations. Tap an option to check yourself.

1. Question 201· Metals and their compounds· WAEC

   Which of the following metals reacts most vigorously with cold water?

   • ACopper
   • BMagnesium
   • CZinc
   • DPotassium

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2. Question 202· Metals and their compounds· WAEC

   The metal that is stored under paraffin oil because it reacts with air and water is

   • Airon
   • Bcopper
   • Csodium
   • Daluminium

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3. Question 203· Metals and their compounds· WAEC

   An alloy is

   • Aan ore
   • Ba pure metal
   • Ca compound of two non-metals
   • Da mixture of a metal with other elements

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4. Question 204· Metals and their compounds· WAEC

   The main ore of iron used in the blast furnace is

   • Abauxite
   • Bhaematite
   • Cgalena
   • Dcassiterite

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5. Question 205· Metals and their compounds· WAEC

   Iron is extracted in the blast furnace using

   • Ahydrogen
   • Belectrolysis
   • Csodium
   • Dcoke, limestone and iron ore

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6. Question 206· Metals and their compounds· WAEC

   Which of these metals does not react with dilute hydrochloric acid?

   • Airon
   • Bzinc
   • Cmagnesium
   • Dcopper

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7. Question 207· Metals and their compounds· WAEC

   Duralumin is used in aircraft bodies because it is

   • Aheavy and brittle
   • Blight and strong
   • Cmagnetic
   • Da good insulator

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8. Question 208· Metals and their compounds· WAEC

   Iron nails in a test tube with boiled water covered by oil do not rust because

   • Aoil reacts with iron
   • Bwater is absent
   • Cthe nail is pure
   • Doxygen is excluded

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9. Question 209· Metals and their compounds· WAEC

   Which metal reacts with cold water to give hydrogen?

   • Acopper
   • Bsodium
   • Ciron
   • Dlead

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10. Question 210· Metals and their compounds· WAEC

    Aluminium is extracted by electrolysis rather than by reduction with carbon because

    • Acarbon is expensive
    • Bits ore is rare
    • Cit is more reactive than carbon
    • Dit has a low melting point

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11. Question 211· Metals and their compounds· WAEC

    Galvanising protects iron by coating it with

    • Azinc
    • Btin
    • Ccopper
    • Dlead

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12. Question 212· Metals and their compounds· WAEC

    A clean iron nail in boiled water covered with a layer of oil does not rust because

    • Ano oxygen can reach it
    • Bno water is present
    • Cthe oil reacts with the iron
    • Dboiled water is acidic

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13. Question 213· Metals and their compounds· WAEC

    Bronze, used for medals and statues, is an alloy of

    • Airon and nickel
    • Bcopper and zinc
    • Ccopper and tin
    • Daluminium and magnesium

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14. Question 214· Metals and their compounds· WAEC

    In the blast furnace, iron is obtained from haematite mainly by reduction with

    • Achlorine
    • Bhydrogen
    • Csodium
    • Dcarbon(II) oxide

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15. Question 215· Metals and their compounds· WAEC

    Aluminium is extracted by

    • Adisplacement by copper
    • Breduction with carbon
    • Cheating alone
    • Delectrolysis of molten alumina in cryolite

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16. Question 216· Metals and their compounds· WAEC

    Aluminium is extracted from

    • Ahaematite
    • Bcassiterite
    • Cgalena
    • Dbauxite

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17. Question 217· Metals and their compounds· WAEC

    Aluminium does not corrode easily because it

    • Ais covered by a thin protective oxide layer
    • Bis unreactive
    • Chas a low density
    • Dis a non-metal

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18. Question 218· Metals and their compounds· WAEC

    The rusting of iron requires both

    • Aheat and light
    • Boxygen and nitrogen
    • Cwater and carbon dioxide
    • Dwater and oxygen

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19. Question 219· Metals and their compounds· WAEC

    Copper is used for electrical wiring because it

    • Ais very hard
    • Bis a good conductor and can be drawn into wires
    • Cdoes not conduct heat
    • Dis magnetic

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20. Question 220· Non-metals and their compounds· WAEC

    Which of these gases can be collected over water?

    • Ahydrogen chloride
    • Bammonia
    • Chydrogen
    • Dsulphur(IV) oxide

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