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5) If one litre of air is passed repeatedly over heated copper and magnesium till no further reduction in volume takes place, the volume finally obtained would be approximately
a) 800 mL
b) 200 mL
c) 10 mL
d) zero
Ans: c
Exp: Noble gases constitute about 1% of the total volume of air. The remaining 99% volume is mainly due to oxygen and nitrogen. When 1 L (1000 mL) of air is passed over heated copper, oxygen is consumed and on further passing over magnesium, nitrogen is consumed according to equations:
2Cu + O2 ® 2CuO
3Mg + N2 ® Mg3N2
In this way about 990 mL of air is consumed. The remaining volume of about 10 mL is due to mainly Ar and other noble gases.
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