Question

Corrosion can be defined as the process of deterioration of a metal due to unwanted chemical or electrochemical interaction of the metal with its environment. Rusting of iron involves the formation of iron oxides by the action of atmospheric moisture and oxygen. Corrosion is usually an undesirable phenomenon since it negatively affects the desirable properties of the metal. For example, iron is known to have good tensile strength and rigidity (especially alloyed with a few other elements). However, when subjected to rusting, iron objects become brittle, flaky, and structurally unsound. Corrosion can be classified as an electrochemical process since it usually involves redox reactions between the metal and certain atmospheric agents such as water, oxygen, sulphur dioxide, etc. It is a spontaneous/ irreversible process wherein the metals turn into a much stable chemical compound like oxides, sulphides, hydroxides, etc. Metals placed higher in the reactivity series such as iron, zinc, etc. get corroded very easily and metals placed lower in the reactivity series like gold, platinum and palladium do not corrode. As we go down the reactivity series tendency to get oxidised is very low (oxidation potentials is very low). Aluminium doesn’t corrode unlike other metals even though it is reactive. This is because aluminium is covered by a layer of aluminium oxide already. This layer of aluminium oxide protects it from further corrosion.When copper metal is exposed to the environment it reacts with the oxygen in the atmosphere to form copper (I) oxide which is red in colour. This CuO reacts with CO2, SO3 and H2O (present in the atmosphere to form Cu2(OH)2(s) (Malachite) which is blue in colour and Cu4SO4(OH)6(s) (Brochantite) which is green in colour. Silver reacts with sulphur and sulphur compounds in the air give silver sulphide (Ag2S) which is black in colour. Rusting of iron which is the most commonly seen example happens when iron comes in contact with air or water. The reaction could be seen as a typical electrochemical cell reaction. Other examples include, Corrosion of Zinc when it reacts with oxygen and HCl to form white coloured ZnCl2. The economic aspects of corrosion are far greater than most people realize; utilities, especially drinking water and sewer systems, suffer the largest economic impact, with motor vehicles and transportation being a close second.
Select the examples that can be categorised as Corrosion *

Formation of green coating of Copper carbonate
Sublimation of camphor
Liquefaction of Ammonia
Tarnishing of Silver
2) Select the incorrect statement from the following options. *

Replacement of corroded equipment is time-consuming
Corrosion causes contamination of product
Corrosion increases the electrical conductivity of metals
Corrosion causes leakage of toxic liquid or gases
3) What type of chemical reaction takes place during rusting of iron? *
Displacement reaction
Photochemical decomposition
Redox reaction
None of the above

pls give correct ans so i will give brilliant

Answer 1

Answer:

1. Formation of green coating of CuCO3 and tarnishing of silver are the examples of corrosion.

2. corrosion increases the electrical conductivity of the metals - is the incorrect statement.

3. Redox reaction