Question : How much percentage of oxygen is present in the atmosphere?
Option 1: 39%
Option 2: 79%
Option 3: 10%
Option 4: 21%
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Correct Answer: 21%
Solution : The correct option is 21% .
Earth's atmosphere is composed of several gases, with the two most abundant being nitrogen and oxygen.
The approximate composition is:
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Question : How much percentage of nitrogen is present in the atmosphere?
Question : The percentage of nitrogen present in ammonium sulphate is:
Question : Simplify the following expression. $\frac{7}{10} \div \frac{3}{7}$ of $\left(2 \frac{3}{10}+2 \frac{3}{5}\right)+\frac{1}{5} \div 1 \frac{2}{5}-\frac{2}{7}$
Question : What is the correct percentage by volume of various gases in Earth's atmosphere?
Question : Oxygen liberated during photosynthesis comes from:
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