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प्रश्न
Explain the environmental effects of chemical reactions?
उत्तर
Generally, there are three types of pollutions viz air, water, and land pollution. Due to increasing human activities lot of chemical substances are produced artificially which harms all the living and non – living things.
Types of chemical substances and their effects:
| S. No | Type of pollution | Chemical substances responsible for the pollution | Effects |
| 1. | Air pollution | Carbon dioxide, Carbon monoxide, oxides of sulphur, oxides of nitrogen, Chlorofluorocarbons, methane, etc. | Acid rain, Global warming, respiratory problems, etc. |
| 2. | Water pollution | Waste water containing chemical substances (e.g dyeing industries), detergents, oil spillage, etc. | Decrease in quality of water, skin diseases, etc. |
| 3. | Land pollution | Fertilizers like urea, various pesticides, herbicides, etc. | Spoilage of land, cancer, respiratory diseases, etc. |
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संबंधित प्रश्न
Match the following.
| Spoilage | Decomposition |
| Ozone | Biocatalyst |
| Tarnishing | Oxygen |
| Yeast | Chemical reaction |
| Calcium oxide | Food |
What happens when an iron nail is placed in copper sulphate solution?
What is tarnishing? Give an example.
Burning of fossil fuels is responsible for global warming. Justify the statement.
Do all the fruits and vegetables undergo browning? Explain.
Classify the following day-to-day activities based on chemical reactions by physical contact, solutions of reactants, heat, light, electricity, and catalyst.
- Burning of crackers during festivals
- Fading of coloured clothes on drying under sunlight.
- Cooking of eggs.
- Charging of batteries.
Kumar is going to build a house. To purchase the iron rods required for construction, he visited an iron and steel shop nearby. The seller showed him some iron rods which are fresh and good. He also showed him little older iron rods which are brownish in appearance. The price of fresh rods is more than the older ones. The seller also gave some offers to older ones. Kumar’s friend Ramesh advised him not to buy the cheaper rods.
- Is Ramesh right in his suggestion?
- Could you explain the reason for his suggestion?
- What are the values shown by Ramesh?
When a magnesium ribbon is burnt in the air, the ash formed is ______.
Reason out
Ozone is produced naturally in the stratosphere.
An element ‘A’ on exposure to moist air turns reddish-brown and a new compound ‘B’ is formed. The substance ‘A’ and ‘B’ are:
