Give two tests for dilute sulphuric acid with balanced equations. State why

(i) BaCl₂

(ii) Pb(NO₃)₂

are used for the above tests

Give a test to distinguish dilute sulphuric acid from dilute HCl and dilute HNO₃.

Select the correct answer from the choice in brackets.

1. The oxidised product obtained when sulphur reacts with conc. H₂SO₄. [H₂S/SO₂/H₂SO₃].
2. The dehydrated product obtained when cane sugar reacts with conc. H₂SO₄. [CO/C/CO₂]
3. The type of salt formed when excess of caustic soda reacts with sulphuric acid. [acid salt / normal salt]
4. The reduced product obtained when hydrogen sulphide reacts with conc. H₂SO₄. [SO₂/S/H₂O]
5. The salt which reacts with dil. H₂SO₄ acid to give an insoluble ppt. [Cu(NO₃)₂/Zn(NO₃)₂/Pb(NO₃)₂]

$\text{Iron pyrites} \xrightarrow{\text{A}} \text{Colourless acidic gas} \xrightarrow{\text{B}} \text{Sulphur trioxide} \xrightarrow{\text{C}} \text{Oleum} \xrightarrow{\text{D}} \text{Sulphuric acid}$

1. Give a balanced equation for the conversion 'A'.
2. The gaseous mixture of the product of conversion 'A' and air contains dust particles as an impurity. Name another impurity in the same mixture.
3. Is the conversion 'B' an exothermic or an endothermic reaction. Would lowering the temperature favour or retard the forward reaction.
4. If the product of conversion 'B' is an acid anhydride of H₂SO₄, the anhydride of conversion 'A' is …………… .
5. State why water is added for the conversion 'D' and not for the conversion 'C'