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प्रश्न
Describe two changes that are harmful. Explain why you consider them harmful. How can you prevent them?
उत्तर
1. Rusting of Iron:
- Why Harmful: Rusting weakens iron and steel structures, leading to potential failures and increased maintenance costs.
- Prevention: Apply protective coatings like paint or use galvanization (coating with zinc) to prevent exposure to moisture and oxygen.
2. Food Spoilage:
- Why Harmful: Spoiled food can cause food poisoning and waste valuable resources.
- Prevention: Store food properly in cool, dry places, use refrigeration, and adhere to proper hygiene practices to slow down spoilage.
संबंधित प्रश्न
In one method of rust prevention, the iron is not coated with anything. Which is this method?
Fill in the following blank with suitable word:
The corrosion of iron is called ................
Give the constituents and one use of brass.
Name two metals which resist corrosion due to the formation of a thin, hard and impervious layer of oxide on their surface.
Explain with reason:
Roasting is carried out on sulphide ores and not on carbonate ores.
Find the odd one out and give its explanation.
Write scientific reason.
On exposure to air, silver articles turn blackish after some time.
Complete flow chart given below.
Marble’s popularity began in ancient Rome and Greece, where white and off-white marble were used to construct a variety of structures, from hand-held sculptures to massive pillars and buildings.
The substance not likely to contain CaCO3 is:
Gold plated ornaments is the example of ______.
