What is the percentage of oxygen by volume in dry air (in $\%$)?
- A$15$
- B$21$
- C$25$
- D$30$
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Pollution is a change in physical,chemical or biological characters of our land and water that may be
Match List-$I$ with List-$II$.
List-$I$ List-$II$ $A$. Sulphate $I$. Pesticide $B$. Fluoride $II$. Bending of bones $C$. Nicotine $III$. Laxative effect $D$. Sodium arsinite $IV$. Herbicide
Choose the correct answer from the options given below.
| List-$I$ | List-$II$ |
| $A$. Sulphate | $I$. Pesticide |
| $B$. Fluoride | $II$. Bending of bones |
| $C$. Nicotine | $III$. Laxative effect |
| $D$. Sodium arsinite | $IV$. Herbicide |
Choose the correct answer from the options given below.
Which is the greatest source of air pollution these days?
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View SolutionIn the upper atmosphere,ozone is formed by the action of which of the following?
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