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प्रश्न
How will you show that air is dissolved in water?
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उत्तर
To show that air is dissolved in the water we take water in a pan and heat it. Just before it boils, you will notice some bubbles at the inner surface of the pan. These bubbles are formed because of air dissolved in water.
संबंधित प्रश्न
What do you observe when Calcium is heated and then tested with moist blue and red litmus – paper?
Write ‘True’ or ‘False’ in front of following statement.
Enamelling is the process of baking a mixture of silicates on the surface of aluminium at a high temperature.
Give reason:
When water is heated, we see bubbles rising up.
Fill in the blank
Aquatic plants and animals use _________ in water.
State the utility of oxygen for respiration in living organisms
Classify the following.
( Dog, Cat, coconut tree, monkey, brinjal plant, papaya plant)
| Things which give out oxygen | Things which give out carbon dioxide |
______ is the percentage of nitrogen in air.
Nitrogen is used in the food packaging industry because it _____.
Which of the following is true about oxygen?
Match the following
| 1. | Oxygen | a. | Carbon dioxide |
| 2. | Azote | b. | Nitrogen |
| 3. | Solvay process | c. | Vital life |
| 4. | Gun powder | d. | No life |
