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Question

When a nail is added to acidic copper sulphate solution, the colour changes from _______.

A
blue to green
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B
green to blue
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C
blue to pink
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D
pink to green
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Solution

The correct option is A blue to green
When a nail is added to acidic copper sulphate solution, the colour changes from blue to green.
Copper sulphate reacts with iron to form iron sulphate.

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