3(ii)
What property of Sulphuric acid is exhibited in each of the following cases:
(a) In the preparation of HCl gas when it reacts with Sodium chloride.
(b) When concentrated Sulphuric acid reacts with Copper to produce Sulphur dioxide gas.
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(a) Non-volatile nature
Reason — Concentrated sulphuric acid has a high boiling point (338°C) and so it is considered to be a non-volatile acid. It is, therefore, used for preparing volatile acids like HCl.
(b) Oxidising property
Reason — The oxidising property of concentrated sulphuric acid is due to the fact that on thermal decomposition, it yields nascent oxygen which oxidises metals.