Advertisements
Advertisements
प्रश्न
Explain why rusting of iron objects is faster in coastal areas than in deserts.
Advertisements
उत्तर
- Both air and moisture are required for rusting to take place. In coastal areas, the quantity of moisture present in the air is greater than that in deserts.
- The amount of moisture in the air is even lower in desert areas. Therefore, iron objects rust faster in coastal areas than in deserts.
APPEARS IN
संबंधित प्रश्न
Explain why Iron sheets are coated with zinc during galvanization.
Name any two metals which do not corrode easily.
What is the corrosion of iron known as?
What are the constituents of stainless steel?
A metal X which is resistant to corrosion is produced by the electrolysis of its molten oxide whereas another metal Y which is also resistant to corrosion is produced by the reduction of its oxide with carbon. Metal X can be used in powder form in thermite welding whereas metal Y is used in making cathodes of ordinary dry cells.
(a) Name the metals X and Y.
(b) Which of the two metals is more reactive : X or Y?
(c) Name one ore or metal X. Also write its chemical formula.
(d) Name one ore or metal Y. Also write its chemical formula.
(e) Name one alloy of metal X and one alloy of metal Y.
Complete flow chart given below.
Give the equation for the formation of rust.
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.
Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg), treated with HNO3, hydrogen is not liberated, why?
Give scientific reasons.
Silver amalgam is used for filling dental cavities.
