(a) Balance the chemical equation given below:
FeS2 + O2 ⟶ Fe2O3 + SO2
(b) Write balanced chemical equation for formation of ‘B’.
(c) Why is it necessary to convert ‘B’ to Oleum?
(d) Identify ‘C’.
(e) Write an equation for the reaction between Oleum and ‘C’.
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(a) 4FeS2 + 11O2 ⟶ 2Fe2O3 + 8SO2
(b) Balanced chemical equation for formation of ‘B’
$2\text{SO}_2 + \text{O}_2 \xrightleftharpoons [450-500\text{^{\circ} C }/1 - 2 \text{ atmos}]{\text{V}_2\text{O}_5} 2\text{SO}_3 + \text{45 K cals}$
(c) Sulphuric acid is not obtained by directly reacting SO3 with water since sulphur trioxide does not dissolve in water satisfactorily and it gives a lot of heat and forms misty droplets of sulphuric acid. Hence, it is converted to oleum.
SO3 + H2SO4 (conc.) ⟶ H2S2O7 (oleum)
(d) C — Water (H2O)
(e) H2S2O7 + H2O ⟶ 2H2SO4