Advertisements
Advertisements
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?
विकल्प
(i) and (ii)
(ii) and (iii)
only (ii)
(i) and (iii)
Advertisements
उत्तर
(i) and (iii)
Explanation:
Painting can prevent rusting and the objects look more beautiful.
APPEARS IN
संबंधित प्रश्न
Two methods by which rusting of iron can be prevented are ______ and ______.
Name two metals which resist corrosion due to the formation of a thin, hard and impervious layer of oxide on their surface.
Brass is an alloy of:
(a) Cu and Sn
(b) Cu and Pb
(c) Pb and Sn
(d) Zn and Cu
Give reason for the following:
A suspension of rust is basic in nature.
To prevent corrosion of iron and steel _______ method is used.
When one of the metals in an alloy is mercury the alloy is called _______.
Write the name.
An alloy of copper and tin-
Draw a neat labelled diagram.
Electroplating
The table shown below gives information about four substances: A, B, C and D.
| SUBSTANCE | MELTING POINT (K) | ELECTRICAL CONDUCTIVITY | |
| SOLID | LIQUID/ AQUEOUS | ||
| A | 295 | Good | Good |
| B | 1210 | Poor | Good |
| C | 1890 | Poor | Good |
| D | 1160 | Poor | Poor |
Identify Ionic compounds from the above given substances.
Explain the chemical reactions in rusting of iron.
