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प्रश्न
CFC is a pollutant.
विकल्प
True
False
उत्तर
CFC is a pollutant- True.
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संबंधित प्रश्न
A chemical reaction is a temporary reaction.
Match the following.
| Spoilage | Decomposition |
| Ozone | Biocatalyst |
| Tarnishing | Oxygen |
| Yeast | Chemical reaction |
| Calcium oxide | Food |
What is tarnishing? Give an example.
Explain how food items are spoiled by chemical reactions?
Explain the role of yeast in making cakes and buns in a bakery?
Burning of fossil fuels is responsible for global warming. Justify the statement.
Do all the fruits and vegetables undergo browning? Explain.
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?
Explain the environmental effects of chemical reactions?
An element ‘A’ on exposure to moist air turns reddish-brown and a new compound ‘B’ is formed. The substance ‘A’ and ‘B’ are:
