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Question

How are the following conversions brought about? Give equations and conditions:
(i) Sulphur trioxide to sulphuric acid.
(ii) Sulphur trioxide to oleum.
(iii) Dilute sulphuric acid to hydrogen.
(iv) Aqueous barium chloride to barium sulphate.
(v) Aqueous lead nitrate to lead sulphate.
(vi) Sodium chloride to hydrogen chloride.
(vii) Sucrose to sugar charcoal.
(viii) Oxalic acid to carbon monoxide.

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Solution

(i) Sulphur trioxide to sulphuric acid:

SO3 + H2O → H2SO4

(ii) Sulphur trioxide to oleum:

SO3 + H2SO4 → H2S2O7
(98%)

(iii) Dilute sulphuric acid to hydrogen:

M + H2SO4 → MSO4 + H2

(iv) Aqueous barium chloride to barium sulphate:

BaCl2 + dilute H2SO4 → BaSO4↓ + 2HCl

(v) Aqueous lead nitrate to lead sulphate:

Pb(NO3)2 + dilute H2SO4 → PbSO4↓ + 2HNO3

(vi) Sodium chloride to hydrogen chloride:
NaCl + conc.H2SO4 <2000C NaHSO4 + HCl

(vii) Sucrose to sugar charcoal:

C12H22O11 Conc. H2SO4 12C + 11H2O

(viii) Oxalic acid to carbon monoxide:

C2H2O4 Conc. H2SO4 H2O + CO + CO2


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