MCQ
Which of the following statement(s) is/ are correct?
- ACarbon dioxide is a colourless gas.
- BOxygen is an odorless gas.
- CAir contains both oxygen and carbon dioxide.
- ✓All of the above.
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$(i)$
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To separate two different but useful components.
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$(ii)$
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To remove useless components.
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$(iii)$
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To remove impurities.
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