The percentage of oxygen in inhaled air is
A) 13%
B) 16%
C) 21%
D) 18%
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Which of the following is CORRECT? (A) 1 mole of oxygen atoms contains 6.0221367 × 10^(23) atoms of oxygen.
(D) All of these 1 mole of atom or ions or molecule or particle contains \(6.0221367 × 10^{23}\) atoms, or ions or molecules or particles respectively. Hence, option (D) is right answer.
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(i) Chalk contains calcium, carbon and oxygen in the ratio 10:3:12. Find the percentage of carbon in chalk. (ii) If in a stick of chalk, carbon is 3g,
Correct Answer - (i) 12% (ii) 25g
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The percentage of oxygen in NaOH is ……………
Option : (A) 40%
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The percentage of carbon dioxide in exhaled air is ………
The percentage of carbon dioxide in exhaled air is 4.4
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‘The air we breathe is made up of lots of other things besides oxygen’. Identify the broad composition of dry air.
Air is a mechanical mixture of a variety of gases. The main constituents of this mixture are nitrogen and oxygen, accounting for almost 99% of the whole, with roughly three...
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The ratio of molecular weight of hydrogen and oxygen in water is 1 : 8. (The relation between hydrogen and oxygen in linear
Correct option is (A) y = 8x \(\because\) Quantities of hydrogen and oxygen are x and y and their quantity are in ratio 1 : 8. \(\therefore\) x : y = 1 : 8 \(\Rightarrow\) \(\frac xy=\frac18\) \(\Rightarrow\) y =...
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Percentage of oxygen in air by volume ………………
Correct option is A) 20.9%
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Percentage of nitrogen in air by volume ………………
Correct option is B) 78.1%
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Percentage of argon in air by volume A) 20.9%
Correct option is D) 0.9%
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The percentage of oxygen in the atmosphere is
The percentage of oxygen in the atmosphere is 12%
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