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Question
Which of the following metals should be chosen to react with CuSO4 solution to change its colour?
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Solution
The correct option is A Iron (Fe)
CuSO4 solution is blue in colour. To make this colour change from blue, Cu should be displaced from this solution.
We know that to displace a metal (in this case, copper (Cu)) from its salt solution (CuSO4), we need a metal which is more reactive than the respective metal. Gold and lead are less reactive than copper and cannot displace it. Iron (Fe) on the other hand is more reactive than copper and hence can displace copper from its salt solution to form ferrous sulphate which is green in colour.
CuSO4 solution is blue in colour. To make this colour change from blue, Cu should be displaced from this solution.
We know that to displace a metal (in this case, copper (Cu)) from its salt solution (CuSO4), we need a metal which is more reactive than the respective metal. Gold and lead are less reactive than copper and cannot displace it. Iron (Fe) on the other hand is more reactive than copper and hence can displace copper from its salt solution to form ferrous sulphate which is green in colour.
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