Which property of sulphuric acid is used in the following:
i As a source of hydrogen when treated in dilute form with metals like Zn Mg Fe etc.
ii Production of hydrogen chloride on treating concentrated add with sodium chloride.
iii Production of sulphur dioxide on heating in concentrated form with copper turnings.
iv Liberation of sulphur from H2S with concentrated form.
v Charring of sugar with hot concentrated add.
vi Liberation of ethylene gas with hot concentrated add.
vii Liberation of carbon monoxide with hot concentrated add.