Oxygen family

Question 1

Removal of sulfur from oil and gas by Claus process:

Answer 1

2 H2S(g) + 3 O2(g) → 2 SO2(g) + 2 H2O(l)
2 H2S(g) + SO2(g) → 3 S(s) + 2 H2O(l)

Question 2

Reaction of chlorine with water:

Answer 2

Cl2(g) + 2 H2O(l) → H3O+(aq) + Cl–(aq) + HClO(aq)
Cl2 + H2O → HCl + HClO

Question 3

Disproportionation of hydrogen peroxide:

Answer 3

2 H2O2(aq) → 2 H2O(l) + O2(g)

Question 4

Production of dihydrogen sulfide:

Answer 4

FeS(s) + 2 HCl(aq) → FeCl2(aq) + H2S(g)

Question 5

Oxidation of dihydrogen sulfide:

Answer 5

2 H2S(g) + 3 O2(g) → 2 SO2(g) + 2 H2O(g)

Question 6

Production of sulfurous acid:

Answer 6

SO2(g) + H2O(l) → H2SO3(aq)

Question 7

Oxidation of sulfur dioxide:

Answer 7

2 SO2(g) + O2(g) → 2 SO3(g)

Question 8

Production of sulfuric acid:

Answer 8

S(s) + O2(g) → SO2(g)
2 SO2(g) + O2(g) →2 SO3(g)
SO3(g) + H2SO4(l) → H2S2O7(l)
H2S2O7(l) + H2O(l) → 2 H2SO4(l)

Question 9

Action of sulfuric acid on sucrose:

Answer 9

C12H22O11(s) → 12 C(s) + 11 H2O(l)