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प्रश्न
What do you observe when Calcium is heated and then tested with moist blue and red litmus – paper?
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उत्तर
Calcium : Red litmus turns blue.
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संबंधित प्रश्न
What is nitrogen-fixation?
Complete and balance the following chemical equation.
\[\ce{HgO ->[heat]}\] ______ + _______
Match the statements in List 1 with the correct answers in List 2
| List 1 | List 2 | ||
| 1 | An impurity in air | A | Water vapour |
| 2 | The component of air which supports combustion | B | Respiration |
| 3 | The inert component in the air slightly soluble in water | C | Rare gases |
| 4 | The component of air which minimizes the rate of evaporation | D | Sulphur dioxide |
| 5 | The process which involves oxidation of food substance in living organisms | E | Helium |
| 6 | The component of air which finds application in observation balloons | F | Carbon dioxide |
| 7 | The process which involves oxidation of substances, liberating heat and light energy | G | Combustion |
| 8 | The component of air which is heavier than air and fairly soluble in water | H | Nitrogen |
| 9 | The process by which atmospheric carbon dioxide is absorbed by plants resulting in the formation of carbohydrates | I | Photosynthesis |
| 10 | The component of air which is lighter than air and less than 1% in air | J | Oxygen |
Name the following:
A process which removes carbon dioxide from the air.
Compare the three main components of air i.e. nitrogen, oxygen and carbon dioxide with reference to their density and solubility, nature and reactivity.
What happens if the percentage of oxygen in the air reaches to 70%?
List uses of oxygen.
The composition of air changes slightly from place to place. Give examples.
Carbon dioxide gas is ______.
Metals like magnesium, iron, and sodium burn in oxygen and give basic ______.
