Question

4)
Colourlesss concentrated sulphuic acid
in a testube Changes to blue on adding
a small piece of copper to it
plz ans this​

Answer 1

Answer:

Colourless concentrated sulphuric acid in a test tube changes to blue an adding a small piece of copper to it because copper displaces hydrogen present in sulphuric acid. as copper attributes blue colour the acid turns blue.

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