Question

when we put the burning candle near the mouth of the test tube consisting sulfuric acid and copper sulphate in a beaker and put iron nail on it​

Answer 1

Here you go

When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed on the surface of iron and the colour of copper sulphate solution changes from blue to light green.

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Answer 2

Answer:

when you dip iron nail in copper sulphate it changes to blue