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ICSE Class 10 Chemistry Question 15 of 62

Study of Compounds — Sulphuric Acid — Question 5

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Question

Question 5

Give balanced equation(s) for :

(a) Reaction of dilute sulphuric acid when poured over sodium sulphite

(b) Manufacture of sulphuric acid by the Contact process.

(c) Heating sulphur with conc. sulphuric acid

(d) Dehydration of sugar crystals by conc. sulphuric acid

(e) Action of concentrated sulphuric acid on carbon.

Answer

(a) Na2SO3 + H2SO4 (dil.) ⟶ Na2SO4 + H2O + SO2

(b) Contact process:

Sulphur or Pyrite Burner:
S + O2 ⟶ SO2
4FeS2 + 11O2 ⟶ 2Fe2O3 + 8SO2

Contact Tower :

2SO2+O2⇌450−500°C /1−2 atmosV2O52SO3+45 K cals2\text{SO}_2 + \text{O}_2 \xrightleftharpoons[450-500\text{\degree C }/1 - 2 \text{ atmos}]{\text{V}_2\text{O}_5} 2\text{SO}_3 + 45 \text{ K cals}

Absorption Tower :
SO3 + H2SO4 ⟶ H2S2O7

Dilution Tank:
H2S2O7 + H2O ⟶ 2H2SO4

(c) S + 2H2SO4 [conc.] ⟶ 3SO2 + 2H2O

(d) C<em>12H</em>22O11Cane Sugar (s)→Conc. H2SO412C (s)Sugar Charcoal+11H2O\underset{\text{Cane Sugar}}{\text{C}<em>{12}\text{H}</em>{22}\text{O}_{11}} \text{ (s)} \xrightarrow{\text{Conc. H}_2\text{SO}_4} \underset{\text{Sugar Charcoal}}{12\text{C (s)}} + 11\text{H}_2\text{O}

(e) C + 2H2SO4 [conc.] ⟶ CO2 + 2H2O + 2SO2