Advertisements
Advertisements
प्रश्न
_______ and ______ are the two gases, which when taken together, make up about 99 percentage of air.
- Nitrogen
- carbon-di-oxide
- Noble gases
- Oxygen
विकल्प
I and II
I and III
II and IV
I and IV
Advertisements
उत्तर
I and IV are the two gases, which when taken together, make up about 99 percentage of air.
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equation.
\[\ce{HgO ->[heat]}\] ______ + _______
Classify Calcium oxide. Also give a balanced equation to prepare it.
Write down the composition of three main gases present in air by volume.
Define the following:
Combustion.
Name the following:
The main, rare (inert) gas present in air.
How do the roots of land plants get oxygen for breathing?
Match the following.
| Nitrogen | Respiration in living animals |
| Oxygen | Fertilizer |
| Carbon dioxide | Refrigerator |
| Dry ice | Fire extinguisher |
______ is necessary for all acids.
______ exists in nature as silicates, carbonates, oxides, and water. It also exists in a free state as part of the air in the atmosphere.
Observe the picture given in figure carefully and answer the following questions.
- What is covering the nose and mouth of the police man?
- Why is he putting a cover on his nose?
- Can you comment on air quality of the place shown in the figure?
