Advertisements
Advertisements
Question
Name any three objects (or structures) which are gradually damaged by the corrosion of iron and steel.
Advertisements
Solution
Following are the three objects that are damaged by corrosion:
(i) Iron railings
(ii) Ships
(iii) Bridges
APPEARS IN
RELATED QUESTIONS
Tinning : Tin : : Galvanizing : _________
Why do we apply paint on iron articles?
Write a chemical equation to show the process of corrosion of iron.
What special name is given to their corrosion of iron?
Fill in the following blanks with suitable words:
Tiffin boxes are electroplated with .............. but car bumpers are electroplated with ............... to protect them from rusting.
Explain why, the galvanised iron article is protected against rusting even if the zinc layer is broken.
A common metal which is highly resistant to corrosion is:
(a) iron
(b) copper
(c) aluminium
(d) magnesium
No chemical reaction takes place when granules of a rusty-brown solid A are mixed with the powder of another solid B. However, when the mixture is heated, a reaction takes place between its components. One of the products C is a metal and settles down in the molten state while the other product D floats over it. It was observed that the reaction is highly exothermic.
(a) What could the solids A and B be?
(b) What are the products C and D most likely to be?
(c) Write the chemical equation for the reaction between A and B leading to the formation of C and D. Mention the physical states of all the reactants and products in this equation and indicate the heat change which takes place.
(d) What is the special name of such a reaction? State one use of such a reaction.
(e) Name any two types of chemical reactions under which the above reaction can be classified.
Name the metal which is a constituent of blood pigment?
What is corrosion? What are necessary conditions for corrosion?
Explain with reason:
Roasting is carried out on sulphide ores and not on carbonate ores.
What is ‘rusting’?
Give reason.
Copper and brass utensils should be tinned.
Give reason for the following:
A suspension of rust is basic in nature.
Write a molecular formula for rust.
Give preventive methods by giving examples of corrosion?
The diagram shows the reaction between metal and dil. acid.
What is the reason for different behaviour of Mg in test tube B?
Give scientific reasons.
Silver amalgam is used for filling dental cavities.
