Question

To show the presence of oxygen and nitrogen in air

Answer 1

⏩Activity to show presence of oxygen, carbon dioxide and nitrogen in air:-

◼Procedure:

✨Take a candle, a glass tumbler and a pan which is filled with some water.

✨Keep the candle upright in the pan and light the candle.

✨Now cover the candle with the glass tumbler.

✨It is observed that the candle extinguishes after some time.

◼Conclusion:

✨This happens because oxygen in the air inside the glass tumbler is utilized in burning the candle. All the oxygen gets converted into carbon dioxide.  

✨Once the candle stops burning, some amount of water is sucked inside the tumbler. This happens because the volume of carbon dioxide is less than the volume of oxygen which was displaced.

✨It is also seen that a lot of air is still inside the tumbler. A major portion of this air is nothing but nitrogen. Nitrogen too does not support burning.

Answer 2

Answer:

Presence of oxygen and nitrogen.

Explanation:

1. The air taken by human beings,animals etc.then,there is shown presence of oxygen.
2. When rhizobium bacteria takes the air is nitrogen so,there is shown.