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Sulphuric acid Question Bank Answer the following questions: (1) The given question are related to manufacture of sulphuric acid Contact process (a) Write balanced chemical equations for reactions that takes place in following chambers; Pyrite burner Contact tower Absorption tower Dilution tank (b) Why sulphur trioxide gas is absorbed in conc.sulphuric acid and not in water. Justify (2) Reaction of conc sulphuric acid with potassium chloride and sodium nitrate. (3) Reaction of carbon with conc sulphuric acid. (4) Reaction of sulphur with conc sulphuric acid (5) Reaction of copper with conc sulphuric acid (6) What happens when con sulphuric acid is added in the following compounds: (Mention the colour change) Glucose Copper sulphate crystals Cane sugar (7) How will distinguish between dil sulphuric acid and dil nitric acid. (8) What happens when SO2 gas is passed through potassium dichromate solution? (9) Write balanced chemical equation for the following reaction: Zn with dil H2SO4 Fe with dil H2SO4 Sodium oxide with dil H2SO4 Copper oxide with dil H2SO4 Zinc oxide with dil H2SO4 Zinc hydroxide with dil H2SO4 (10) Write the equation for the laboratory preparation of: (a) Sodium sulphate using dilute sulphuric acid. (b) Lead sulphate using dilute sulphuric acid. (11) Write balanced equation for the reaction between (a) Potassium hydrogen carbonate and dilute sulphuric acid. (b) Sodium hydrogen sulphite with dilute sulphuric acid. (c) Ferrous sulphide with dilute sulphuric acid. (d) Copper carbonate with dil. Sulphuric acid (12) Write the equations for the laboratory preparation of the following salts using sulphuric acid. (a) Copper sulphate from copper. (b) Lead sulphate from lead nitrate (13) Concentrated sulphuric acid is both an oxidizing agent and a non-volatile acid. Write one equation each to illustrate the above mentioned properties of sulphuric acid. (14) Some properties of sulphuric acid are given below. Choose the role played by sulphuric acid in each case. A: Dilute acid B: Oxidising agent C: Non-volatile acid D: Dehydrating agent. 1. CuO + H2SO4 CuSO4 + H2 O 2. C6H12O6 6C + 6H2O 3. Fe + H2SO4 FeSO4 + H2 4. Na2SO3 + H2SO4 5. Cu + 2H2SO4 6. NaNO3 + H2SO4 NaSO4 + H2O + SO2 CuSO4 + 2H2O + SO2 NaNO3 + HNO3 Important instructions related to sulphuric acid: Catalyst used in the contact process Vanadium pentoxide (V2O5) Formula of oleum H2S2O7 Reaction with conc sulphuric acid SO2 is liberated Reaction of metals with dil sulphuric acid Hydrogen gas Reaction of carbonates and bi-carbonates with Carbon dioxide gas dil sulphuric acid Reaction of sulphite and bi-sulphites with dil Sulphur dioxide sulphuric acid Reaction of sulphides with dil sulphuric acid Hydrogen sulphide Potassium dichromate solution colour change Orange to clear green on passing sulphur dioxide gas through it Note: 1. Use con sulphuric acid only for copper; incase asked to prepare copper sulphate all other metals will react with dil sulphuric acid. 2. Formula of sulphite is SO3 ( Eg. Sodium sulphite Na2SO3) 3. Sulphide is S ( Eg. Ferrous sulphide FeS) 4. Valency of bi-carbonte/ bi-sulphite is 1 5. Always use lead in form of lead oxide or hydroxide 6. Whenever reaction s between acid and base ; acid used is always dilute.
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