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ICSE Class 10 Chemistry Question 9 of 62

Study of Compounds — Sulphuric Acid — Question 1

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Question 1

What property of conc. H2SO4 is made use of in each of the following cases? Give an equation for the reaction in each case:

(a) in the production of HCl gas when it reacts with a chloride,

(b) in the preparation of CO from HCOOH.

(c) as a source of hydrogen by diluting it and adding a strip of magnesium.

(d) in the preparation of sulphur dioxide by warming a mixture of conc. sulphuric acid and copper-turnings.

(e) hydrogen chloride gas is passed through concentrated sulphuric acid.

(f) it's reaction with (i) Ethanol (ii) Carbon.

Answer

(a) The property of being a non-volatile acid is used.

NaCl + H2SO4 [conc.] →<200°C\xrightarrow{\lt 200 \degree\text{C}} NaHSO4 + HCl

(b) The property of being a dehydrating agent is used.

HCOOH →Conc. H2SO4\xrightarrow{\text{Conc. H}_2\text{SO}_4} CO + H2O

(c) The acidic property is used.

Mg + H2SO4 [dil.] ⟶ MgSO4 + H2 ↑

(d) The property of being an oxidizing agent is used.

Cu + 2H2SO4 [conc.] ⟶ CuSO4 + 2H2O + SO2 ↑

(e) The property of being a drying agent is used.

Hydrogen chloride gas is dried by passing through conc. sulphuric acid as it does not react with conc. sulphuric acid.

(f) (i) The property of being a dehydrating agent is used.

C2H5OH ethyl alcohol→170°CConc. H2SO4[excess]C2H4ethene↑+H2O \underset{\text{ ethyl alcohol}}{\text{C}_2\text{H}_5\text{OH}} \xrightarrow[170\degree\text{C}]{\text{Conc. H}_2\text{SO}_4\text{[excess]}} \underset{ \text{ethene}}{\text{C}_2\text{H}_4} ↑ + \text{H}_2\text{O}\

(ii) The property of being an oxidizing agent is used.

C + 2H2SO4 [conc.] ⟶ CO2 + 2H2O + 2SO2 ↑