Sulfuric acid

Question 1

Contact process

Answer 1

• S + O2 -> SO2 ( furnace )
• 2SO2 + O2 -> 2SO3 ( catalytic converter )
• SO3 + H2SO4 -> H2S2O7 ; oleum ( absorber )
• H2S2O7 + H2O -> 2H2SO4

Conditions
- V205 catalyst
- 450^C
- 1atm

Question 2

Properties of SO2

Answer 2

• colourless gas
• choking & irritating smell
• acidic gas
• reducing agent ( anti-oxidant )
• bleaching agent
• poisonous gas

Question 3

Uses of SO2

Answer 3

• industrial bleaching agent
• making of paper
• food preservative
• manufacture of H2SO4
• refrigerant

Question 4

Uses of H2SO4

Answer 4

• making of paints & detergents
• making of fertilisers like ammonium sulfate
• car batteries
• jewellery

Question 5

Properties of dilute H2SO4

Answer 5

• reacts with metals to liberate H2 gas with effervescence
• reacts with carbonates to liberate CO2 with effervescence
• neutralises bases & alkalis

Question 6

Properties of H2SO4

Answer 6

• oxidising agent
• dehydrating agent
• can be used as drying agent for many gases except ammonia gas.