colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.
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Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it because copper displaces hydrogen from sulphuric acid and forms blue colored copper sulphate.❤
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d) Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it because copper displaces hydrogen from sulphuric acid and forms blue colored copper sulphate.
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