Advertisements
Advertisements
प्रश्न
Name five methods of preventing rusting of iron.
Advertisements
उत्तर
- Rusting of iron can be prevented by painting.
- Rusting of iron can be prevented by applying grease or oil.
- Rusting of iron can be prevented by galvanisation.
- Rusting of iron can be prevented by tin-plating and chromium plating.
- Rusting of iron can be prevented by alloying it to make stainless steel.
APPEARS IN
संबंधित प्रश्न
Which metals do not corrode easily?
What are alloys?
The corrosion of copper produces a ______ coating of basic copper carbonate on its surface.
What are the constituents of stainless steel?
A common metal which is highly resistant to corrosion is ______.
Explain how the activity series accounts for each of the following:
tendency to corrosion
Compare roasting and calcination.
Explain with reason:
Roasting is carried out on sulphide ores and not on carbonate ores.
Identify the process shown in the diagram and explain it in short
What are the adverse effects of corrosion?
Give reason.
A wooden article should be polished.
Give reason for the following:
A suspension of rust is basic in nature.
State whether the statement given below is true or false. If false write the correct statement.
Graphite is a lustrous non-metal which conducts electricity.
Observe the following picture and answer the following questions:
- What is rust?
- Write the chemical formula of rust.
- Write the reaction of oxidation of iron at the anode.
- Write the reaction of oxidation of iron at the cathode.
- What is corrosion?
Stainless steel is an alloy of _______.
Write the name.
An alloy of copper and tin-
Which among the following alloys contain mercury as one of its constituents?
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.
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:
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?
