JAMB Chemistry questions: Air

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

1. Question 1· Air· JAMB

   Air is regarded as a mixture because

   • Aits components can be separated by physical means
   • Bit contains oxygen
   • Cit is colourless
   • Dit supports burning

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2. Question 2· Air· JAMB

   The percentage of argon in dry air is about

   • A78%
   • B21%
   • C0.9%
   • D0.03%

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3. Question 3· Air· JAMB

   Which gas in the air do green plants use for photosynthesis?

   • Aargon
   • Bnitrogen
   • Ccarbon(IV) oxide
   • Dneon

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4. Question 4· Air· JAMB

   A candle burning in a closed jar soon goes out because

   • Athe oxygen in the jar is used up
   • Bthe jar becomes too hot
   • Cnitrogen is produced
   • Dthe wax runs out

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5. Question 5· Air· JAMB

   The approximate percentage by volume of carbon(IV) oxide in clean air is

   • A1%
   • B21%
   • C0.04%
   • D78%

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6. Question 6· Air· JAMB

   Oxygen and nitrogen are obtained industrially from air by

   • Afractional distillation of liquid air
   • Belectrolysis of water
   • Cheating limestone
   • Dburning charcoal

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7. Question 7· Air· JAMB

   Which gas turns lime water milky but has NO effect on acidified potassium heptaoxodichromate(VI)?

   • Aammonia
   • Bsulphur(IV) oxide
   • Ccarbon(IV) oxide
   • Dhydrogen sulphide

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8. Question 8· Air· JAMB

   Incomplete combustion of fuels in a limited supply of air produces

   • Aoxygen
   • Bcarbon(II) oxide
   • Cnitrogen
   • Dozone

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9. Question 9· Air· JAMB

   In the fractional distillation of liquid air, the first gas to boil off is nitrogen because it has the

   • Amost reactivity
   • Bhighest boiling point
   • Cgreatest density
   • Dlowest boiling point

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10. Question 10· Air· JAMB

    Argon makes up about what percentage of the air by volume?

    • A78%
    • B21%
    • C0.04%
    • D1%

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11. Question 11· Air· JAMB

    The most abundant gas in the atmosphere is:

    • Aoxygen
    • Bcarbon dioxide
    • Cnitrogen
    • Dargon

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12. Question 12· Air· JAMB

    Iron rusts only when it is exposed to

    • Anitrogen and water
    • Boxygen alone
    • Cwater alone
    • Dboth oxygen and water

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13. Question 13· Air· JAMB

    Weather balloons are filled with helium because it is

    • Alight and non-flammable
    • Bheavy
    • Cpoisonous
    • Dcoloured

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14. Question 14· Air· JAMB

    Liquid air is fractionally distilled mainly to obtain

    • Ahydrogen
    • Boxygen and nitrogen
    • Cchlorine
    • Dcarbon(II) oxide

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15. Question 15· Air· JAMB

    In terms of oxygen, the rusting of iron is

    • Aa physical change
    • Ba reduction reaction
    • Ca neutralisation reaction
    • Dan oxidation reaction

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16. Question 16· Air· JAMB

    The part of the air that supports combustion is

    • Acarbon(IV) oxide
    • Bnitrogen
    • Cargon
    • Doxygen

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17. Question 17· Air· JAMB

    The rusting of iron in moist air is an example of

    • Aoxidation
    • Breduction only
    • Cneutralisation
    • Dsublimation

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18. Question 18· Air· JAMB

    The noble gases are unreactive because

    • Athey are colourless
    • Bthey are very light
    • Cthey are rare
    • Dtheir outer electron shells are full

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19. Question 19· Air· JAMB

    100 cm³ of air is passed repeatedly over heated copper until there is no further change. The volume left is about

    • A21 cm³
    • B79 cm³
    • C100 cm³
    • D50 cm³

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20. Question 20· Air· JAMB

    Two gases that contribute most to global warming are

    • Aoxygen and nitrogen
    • Bcarbon(IV) oxide and methane
    • Cargon and neon
    • Dhydrogen and helium

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