IGNOU CHE 2 2018 - Write the reactions for the following:i) Reaction showing acidic beh

Question

Write the reactions for the following:
i) Reaction showing acidic behaviour of sulphur dioxide
ii) Reaction depicting the sulphonation by H₂SO₄
iii) Reactions of lead chambers during the manufacture of H₂SO₄ by Lead Chamber process
iv) Reaction distinguishing between peroxomonosulphuric acid and peroxodisulphuric acid
v) Reduction reaction of H₂O₂ with chlorine

24 Jan 2018

Answer :

Word Count : 348

i).Sulfur dioxide: Sulfur dioxide is fairly soluble in water, reacting to give a solution of sulfurous acid (also known as sulfuric(IV) acid), H2SO3, as shown in the reaction below. This species only exists in solution, and any attempt to isolate it gives off sulfur dioxide.

SO2+H2O→H2SO3

ii)Heat benzene under reflux with concentrated sulfuric acid for several hours.

Warm benzene under reflux at 40°C with fuming sulfuric acid for 20 to 30 minutes.

C6H6+H2SO4→C6H5SO3H+H2O

iii) Sulfur dioxide is generated by burning elemental sulfur or by roasting pyritic ore in a current of air:

S8 + 8 O2 → 8 SO2

4 FeS2 + 11 O2 → 2 Fe2O3 + 8 SO2

Nitrogen oxides are produced by decomposition of niter in the presence of sulfuric acid or hydrolysis of nitrosylsulfuric acid:

2 NaNO3 + H2SO4 → Na2SO4 + H2O + NO

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