JAMB Chemistry questions

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

1. Question 261· Metals and their compounds· JAMB

   Cryolite is added in the extraction of aluminium to

   • Acolour the metal
   • Braise its melting point
   • Cpurify the anode
   • Dlower the melting point of alumina

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2. Question 262· Metals and their compounds· JAMB

   In the blast furnace, iron is extracted from its ore using

   • Aelectricity and cryolite
   • Bcoke and limestone
   • Chydrogen and nickel
   • Dsodium and chlorine

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3. Question 263· Metals and their compounds· JAMB

   Aluminium is extracted from its ore by:

   • Aelectrolysis of alumina dissolved in molten cryolite
   • Breduction with carbon
   • Croasting in air
   • Ddisplacement with sodium

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4. Question 264· Metals and their compounds· JAMB

   Transition metals commonly

   • Aform coloured compounds and act as catalysts
   • Bare very soft
   • Chave only one oxidation state
   • Dare gases

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5. Question 265· Metals and their compounds· JAMB

   Galena is an ore of

   • Airon
   • Baluminium
   • Clead
   • Dcopper

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6. Question 266· Metals and their compounds· JAMB

   Brass is an alloy of

   • Alead and tin
   • Bcopper and tin
   • Ciron and carbon
   • Dcopper and zinc

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7. Question 267· Metals and their compounds· JAMB

   Which metal reacts violently with cold water?

   • Apotassium
   • Bcopper
   • Ciron
   • Dzinc

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8. Question 268· Metals and their compounds· JAMB

   Copper is widely used for electrical wiring because it

   • Ais a good conductor and can be drawn into wires
   • Bis cheap and brittle
   • Cis magnetic
   • Ddoes not conduct heat

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9. Question 269· Non-metals and their compounds· JAMB

   Silicon is used mainly in

   • Afertilisers
   • Bsemiconductor chips
   • Cbleaching
   • Dfuels

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10. Question 270· Non-metals and their compounds· JAMB

    Chlorine gas is identified by its:

    • Abrown colour
    • Brotten-egg smell
    • Cgreenish-yellow colour and bleaching action
    • Dability to relight a glowing splint

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11. Question 271· Non-metals and their compounds· JAMB

    The allotropes of carbon include:

    • Aozone and oxygen
    • Bred and white phosphorus
    • Crhombic and monoclinic sulphur
    • Dgraphite and diamond

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12. Question 272· Non-metals and their compounds· JAMB

    Ammonia gas is collected by upward delivery because it is

    • Apoisonous
    • Bdenser than air
    • Cinsoluble in water
    • Dless dense than air and very soluble in water

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13. Question 273· Non-metals and their compounds· JAMB

    The two crystalline allotropes of sulphur are

    • Aplastic and amorphous
    • Bgraphite and diamond
    • Cred and white
    • Drhombic and monoclinic

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14. Question 274· Non-metals and their compounds· JAMB

    Which halogen is a liquid at room temperature?

    • Afluorine
    • Bchlorine
    • Ciodine
    • Dbromine

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15. Question 275· Non-metals and their compounds· JAMB

    Moist chlorine bleaches damp litmus paper because it

    • Aforms hydrogen gas
    • Bis a strong reducing agent
    • Cis green
    • Dforms chloric(I) acid (HOCl), which releases oxygen

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16. Question 276· Non-metals and their compounds· JAMB

    Ammonia gas can be identified because it

    • Arelights a glowing splint
    • Bturns lime water milky
    • Cturns damp red litmus paper blue
    • Dbleaches damp litmus paper

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17. Question 277· Non-metals and their compounds· JAMB

    Ozone is an allotrope of

    • Anitrogen
    • Boxygen
    • Ccarbon
    • Dsulphur

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18. Question 278· Non-metals and their compounds· JAMB

    Hydrogen sulphide smells of

    • Aammonia
    • Brotten eggs
    • Cchlorine
    • Dvinegar

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19. Question 279· Non-metals and their compounds· JAMB

    A solution gives a white precipitate with silver trioxonitrate(V) solution. It contains

    • Asulphate ions
    • Bchloride ions
    • Ccarbonate ions only
    • Dnitrate ions

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20. Question 280· Non-metals and their compounds· JAMB

    Carbon(IV) oxide is prepared in the laboratory by the action of dilute hydrochloric acid on

    • Amarble chips
    • Bcopper turnings
    • Czinc granules
    • Dsodium chloride

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    Explanation and discussion