Chemistry
1. Give a balanced equation for the conversion 'A'. 2. The gaseous mixture of the product of conversion 'A' and air contains dust particles as an impurity. Name another impurity in the same mixture. 3. Is the conversion 'B' an exothermic or an endothermic reaction. Would lowering the temperature favour or retard the forward reaction. 4. If the product of conversion 'B' is an acid anhydride of H<sub>2</sub>SO<sub>4</sub>, the anhydride of conversion 'A' is ............... . 5. State why water is added for the conversion 'D' and not for the conversion 'C'
Answer
- 4FeS2 + 11O2 ⟶ 2Fe2O3 + 8SO2
- Arsenious oxide (As4O6)
- The catalytic oxidation of SO2 to SO3 is an exothermic reaction. According to Le Chatelier's principle, higher yield of the product is obtained by lowering the temperature.
- acid anhydride of H2SO3 (Sulphurous acid)
- Sulphur trioxide is not directly absorbed in water to give sulphuric acid as the reaction is highly exothermic resulting in production of a dense fog of sulphuric acid particles which do not condense easily.
Hence, sulphur trioxide vapours are dissolved in conc. sulphuric acid to give oleum which on dilution with the requisite amount of soft water in the dilution tank gives sulphuric acid of the desired concentration.
Related Questions
State three different chemical compounds other than acids manufactured industrially from sulphuric acid.
Select the correct answer from the choice in brackets.
- The oxidised product obtained when sulphur reacts with conc. H2SO4. [H2S/SO2/H2SO3].
- The dehydrated product obtained when cane sugar reacts with conc. H2SO4. [CO/C/CO2]
- The type of salt formed when excess of caustic soda reacts with sulphuric acid. [acid salt / normal salt]
- The reduced product obtained when hydrogen sulphide reacts with conc. H2SO4. [SO2/S/H2O]
- The salt which reacts with dil. H2SO4 acid to give an insoluble ppt. [Cu(NO3)2/Zn(NO3)2/Pb(NO3)2]
Give balanced equations for the following reactions using sulphuric acid.
- Formation of a black mark on a piece of wood on addition of conc. H2SO4 to it.
- Oxidation of a foul smelling acidic gas, heavier than air and fairly soluble in H2O by conc. H2SO4.
- Formation of an acid salt from sulphuric acid and (a) an alkali (b) a sodium salt.
- Formation of a hydrocarbon from an organic compound
- Formation of sulphur dioxide using a metal below hydrogen in the activity series.
Match the conversions in column 'X' using sulphuric acid, with the type of chemical property of sulphuric acid A to E it represents in column 'Y'
X Y 1. Nitre → Nitric acid A: As an oxidising agent 2. Copper [II] oxide → Copper [II] sulphate B: As a dibasic acid 3. Copper → Copper [II] sulphate C: As an acid when dilute 4. Ethanol [ethyl alcohol] → Ethene D: As a least or non-volatile acid 5. Sodium hydroxide → Sodium bisulphate and sodium sulphate As a dehydrating agent.