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ICSE Class 10 Chemistry Question 51 of 62

Study of Compounds — Sulphuric Acid — Question 53

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53
Question

Question 4(2017)

Write balanced chemical equations to show –

(i) The oxidizing action of conc. sulphuric acid on carbon.

(ii) The behaviour of H2SO4 as an acid when it reacts with magnesium.

(iii) The dehydrating property of conc. sulphuric acid with sugar.

(iv) The conversion of SO3 to sulphuric acid in the Contact process.

Answer

(i) C + 2H2SO4 (conc.) ⟶ CO2 + 2SO2 + 2H2O

(ii) Mg + H2SO4 (dil.) ⟶ MgSO4 + H2 (g)

(iii) C12H22O11→Conc. H2SO412C [sugar charcoal]+11H2O\text{C}_{12}\text{H}_{22}\text{O}_{11}\xrightarrow{\text{Conc. H}_2\text{SO}_4} \text{12C} \small{\space[sugar\space charcoal]} + \text{11H}_2\text{O}

(iv) SO3 + H2SO4 (conc.) ⟶ H2S2O7 (oleum)
H2S2O7 + H2O ⟶ 2H2SO4 (conc.)