Important Past Questions:
Write balanced equations for the following reactions:
i) Lead sulphate from lead nitrate solution and dilute sulphuric acid. (2007)
ii) Copper sulphate from copper and conc. sulphuric acid. (2007)
iii) dil. H2SO4 and barium chloride. (2008)
iv) dil. H2SO4 and sodium sulphide. (2008)
v) Heat on sulphur with conc. H2SO4. (2010, 2015, 2017)
vi) Reaction of sugar with conc. H2SO4. (2010, 2013, 2017)
vii) Zinc oxide to zinc sulphate. (2010)
viii) Dilute sulphuric acid is poured over sodium sulphite. (2011, 2016)
ix) Manufacture of sulphuric acid by Contact process. (2011)
x) Zinc sulphide and dilute sulphuric acid. (2012)
xi) Action of concentrated sulphuric acid on carbon. (2014, 2017, 2018)
xii) Action of sulphuric acid on potassium hydrogen carbonate. (2015)
xiii) The behavior of H2SO4 as an acid when it reacts with magnesium. (2017)
xiv) The conversion of SO3 to sulphuric acid in the Contact process. (2015, 2017)
Choose the property of sulphuric acid A, B, C, or D which is responsible for the reactions.
A] Dilute Acid B] Dehydrating agent C] Non-volatile acid D] Oxidising agent
i) C12H12O11+ nH2SO4 → 12C + 11H2O + nH2SO4
ii) S + 2H2SO4 → 3SO2 + 2H2O,
iii) NaCl + H2SO4 → NaHSO4 + HCl,
iv) CuO + H2SO4 → CuSO4 + H2O
v) Na2CO3 + H2SO4 → Na2SO4 + H2O + CO2
vi) CuSO4 • 5H2O → CuSO4 + 5H2O
vii) S + H2SO4 (conc.) → 3SO2 + 2H2O
viii) NaNO3 + H2SO4 (conc.) → NaHSO4 + HNO3 (<200°C)
ix) MgO + H2SO4 → MgSO4 + H2O
x) Zn + 2H2SO4 (conc.) → ZnSO4 + SO2 + 2H2O
What property of sulphuric acid is used/shown when:
i) Sugar turns black in its presence. (2006, 2008)
ii) It can be used in the preparation of HCl and HNO3 acids. (2008)
iii) Conc. sulphuric acid reacts when heated with potassium nitrate. (2011)
iv) Conc. sulphuric acid reacts when heated with carbon. (2011, 2018)
Choose the correct answer:
i) Dil. H2SO4 will produce a white ppt. when added to a soln. of:
A] Copper nitrate B] Zinc nitrate C] Lead nitrate D] Sodium nitrate (2008)
ii) The solution which liberates sulphur dioxide gas from sodium sulphite:
A] Sodium hydroxide solution B] A weak acid C] Dilute sulphuric acid (2010)
iii) The gas evolved when dil. sulphuric acid reacts with iron sulphide:
A] Hydrogen sulphide B] Sulphur dioxide C] Sulphur trioxide D] Vapour of sulphuric acid (2011)
iv) The catalyst used in the Contact process is:
A] Copper B] Iron C] Vanadium pentoxide D] Manganese dioxide (2018)
State the observation when:
i) Sugar crystals are added to conc. sulphuric acid. (2011, 2016)
ii) Conc. H2SO4 is added to a crystal of hydrated copper sulphate. (2013, 2017)
Name the gas produced on reaction of dilute sulphuric acid with a metallic sulphide.
State any two conditions for the conversion of sulphur dioxide to sulphur trioxide.
Identify the substance:
i) The acid which is used in the preparation of a non-volatile acid.
ii) The acid which produces sugar charcoal from sugar.
iii) The acid on mixing with lead nitrate soln. produces a white ppt. which is insoluble even on heating.
State how will you distinguish between dilute hydrochloric acid and dilute sulphuric acid using lead nitrate solution.
Give one equation each to show the following properties of sulphuric acid:
i) Dehydrating property ii) Acidic nature iii) As a non-volatile acid
Name the process used for the large scale manufacture of sulphuric acid.
Making use of only the substances given: dil. sulphuric acid, sodium carbonate, zinc, sodium sulphite, lead, calcium carbonate: give equations for the reactions by which you would obtain:
ii) sulphur dioxide
iii) carbon dioxide
iv) zinc carbonate (2 steps)
Copy and complete the following table relating to an important industrial process and its final output.