Give Reason colourless concentrated sulphyruc acid in a test tube changes to bluebon adding a small piece of copper to it

Give Reason colourless concentrated sulphyruc acid in a test tube chan

1.	Give Reason colourless concentrated sulphyruc acid in a test tube changes to bluebon adding a small piece of copper to it
Answer» 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 coloured copper sulpha