Q.3 Archit dropped an iron blade in a beaker containing copper sulphate solution . After sometime he observed a reddish brown coating on the surface of blade . Iron sulphate Copper sulphate ( a ) Name the substance that formed the reddish brown coating on the blade . ( b ) Would you expect the colour of the solution to change ? If so , what change would you expect to observe ? ( C ) Is this reaction an example of physical change ? Give reason to justify your reason .
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Explanation:
A chemical reaction occurs in which Iron being more reactive than copper displaces, Copper from copper sulphate solution. This is a displaement reaction. This process of coating one metal on the other is called as Electroplating.
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Answer:
When a metal is attacked by substances around it such as moisture, acids, etc. it is said to corrode and this process is called corrosion. After corrosion, the colour of: Iron changes to → Reddish brown Silver changes to → black Copper changes to → green.
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