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प्रश्न
What is pollution?
एका वाक्यात उत्तर
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उत्तर
Unwanted change in physical, chemical, and biological properties of the environment. This is termed pollution.
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Effects of Chemical Changes: Production of Heat, Light, Sound and Pressure
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संबंधित प्रश्न
Burning of matchstick is an example for chemical reaction caused by _______
_______ undergoes rusting.
Which of the following factor induces electrtolysis?
In Haber’s process of producing ammonia _______ is used as a catalyst.
Decomposition of lead nitrate is an example for a chemical reaction caused by light.
Light energy may come out due to chemical reactions.
Match the following.
| Rusting | Photosynthesis |
| Electrolysis | Haber’s process |
| Thermolysis | Iron |
| Food | Brine |
| Catalysis | Decomposition of limestone |
What happens to the brine during electrolysis?
On heating, calcium carbonate gives calcium oxide and oxygen. Is it an exothermic reaction or an endothermic reaction?
Lead nitrate produces brown gas on heating.
