Effect of Oxidation Reactions in Daily Life
Category : 10th Class
Many oxidation reactions take place in our daily life. Some of them are useful while others are harmful. The two such common oxidation reactions are:
It is the degradation of metals due to their reaction with oxygen. Carbon-dioxide, water etc.
It is a common type of corrosion. It is formed when iron comes in contact with moist air. As a result of corrosion a reddish brown layer of ferric oxide is formed which is called is called rust.
\[4F{{e}_{(s)}}+3{{O}_{2(g)}}+2n{{H}_{2}}O\to 2F{{e}_{2}}{{O}_{3}}\cdot n{{H}_{2}}{{O}_{(S)}}\] (Rust)
Copper articles when left out in moist air gets coated with a green layer. This is another example of corrosion where copper gets coated with basic copper carbonate layer.
\[2\,C{{u}_{(s)}}+C{{O}_{2}}_{(g)}+{{O}_{2}}_{(g)}\to CuC{{O}_{3}}\cdot Cu{{(OH)}_{2}}\]
It weakens the metal and makes it brittle and reduces the tensile strength.
Methods of Preventing Corrosion
The spoiling of metals due to corrosion can be prevented by
Do you know that corrosion can sometimes be advantageous. For e.g. Aluminium is a good conductor of electricity and is used in high tension wires. When it is exposed to air, it gets coated with a white protective layer of aluminium oxide \[(A{{l}_{2}}{{O}_{3}})\], this layer prevents the further corrosion of metal by moist air.
Racidity
Often the food cooked is changed in taste if kept open for long, this is because the fats get oxidized an hence are degraded with time and start emitting bad smell.
The oxidation of oils and fats present in the foodstuff resulting into a bad odor and taste is called rancidity.
Methods to prevent rancidity:
The process of coating iron with zinc is called:
(a) Electroplating
(b) Polishing
(c) Galvanization
(d) Reduction
(e) None of these
Answer: (c)
Explanation
Galvanization is the process of coating iron with zinc in order to prevent its rusting.
Rancidity is due to:
(a) Reduction of oils and fats
(b) Oxidation of oils and fats
(c) Displacement of oil and fats
(d) Combination of oils and fats
(e) None of these
Answer: (b)
Explanation
Oxidation of oils and fats present in food stuff is called rancidity.
Identify the substance which is reduced in the given reaction below?
\[Pb{{S}_{(s)o}}+4{{H}_{2}}{{O}_{2}}_{(aq)}\to Pb\,S{{O}_{4}}_{(s)}+4{{H}_{2}}{{O}_{(e)}}\]
(a) Hydrogen peroxide
(b) Lead sulphide
(c) Both Lead sulphide and Hydrogen peroxide
(d) Water
(e) None of these
Answer: (a)
Which one of the following is an example of displacement reaction?
(a) \[C{{l}_{2}}+2KBr\to 2KCl+B{{r}_{2}}\]
(b) \[2K+{{I}_{2}}\to 2Kl\]
(c) \[2{{H}_{2}}S+S{{O}_{2}}\to 2{{H}_{2}}O+3S\]
(d) \[CaO+{{H}_{2}}O\to Ca{{(OH)}_{2}}\]
(e) None of these
Answer: (a)
Which one of the following is an example of addition reaction?
(a) \[C{{l}_{2}}+2KBr\to 2KCl+B{{r}_{2}}\]
(b) \[Fe+CuS{{O}_{4}}\to FeS{{O}_{4}}+Cu\]
(c) \[2{{H}_{2}}S+S{{O}_{2}}\to 2{{H}_{2}}O+3S\]
(d) \[CaO+{{H}_{2}}O\to Ca{{(OH)}_{2}}\]
(e) None of these
Answer: (d)
(s): It represents the solid state
(I): It represents the liquid state
(g): It represents the gaseous state
(aq): Aqueous state i.e. solution in water
(ppt): Precipitate
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