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प्रश्न
A man painted his main gate made up of iron, to
- prevent it from rusting.
- protect it from sun.
- make it look beautiful.
- make it dust free.
Which of the above statement(s) is/are correct?
पर्याय
(i) and (ii)
(ii) and (iii)
only (ii)
(i) and (iii)
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उत्तर
(i) and (iii)
Explanation:
Painting can prevent rusting and the objects look more beautiful.
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संबंधित प्रश्न
Explain the term corrosion.
Give reasons:
Platinum, gold and silver are used to make jewellery.
In one method of rust prevention, the iron is not coated with anything. Which is this method?
Explain the term – rusting and give a word equation for the formation of rust. If polished iron nails are kept in three separate test tubes, state the contents in each test tube required, to prove the conditions for rusting.
Explain concept with example/explain with the help of a balanced equation.
Corrosion
Write a molecular formula for rust.
Observe the following diagram and give answers.
- Name this method of prevention of corrosion.
- For prevention of which metal this method is used?
- What is used as anode in this method?
State two conditions necessary for rusting of iron.
Explain the following:
Lime water turns milky on passing carbon dioxide gas into it.
Describe two changes that are harmful. Explain why you consider them harmful. How can you prevent them?
