IGCSE Chemistry 0971/11/M/J/21 Q29

Question

29 Which two gases make up approximately 99% of clean, dry air?
A carbon dioxide and nitrogen
B carbon dioxide and oxygen
C nitrogen and oxygen
D argon and nitrogen

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Answer ( 1 )

    0
    2022-07-08T12:23:58+08:00

    Nitrogen makes up 78% and oxygen makes up 21%

    Ans: C

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