Question 1
Acid rain can be up to 50 times more acidic than normal rain, which has a pH around 5.5. What is the approximate concentration of H+ in acid rain?
2.50 10-3 mol dm-3
2.50 10-4 mol dm-3
2.50 10-5 mol dm-3
50.0 10-4 mol dm-3
Acid rain can be up to 50 times more acidic than normal rain, which has a pH around 5.5. What is the approximate concentration of H+ in acid rain?
2.50 10-3 mol dm-3
2.50 10-4 mol dm-3
2.50 10-5 mol dm-3
50.0 10-4 mol dm-3
Natural gas contains on average 5.5 mg / m3 of sulfur in the form of hydrogen sulfide, H2S (Mr = 34). If a typical household in the UK consumes 0.198 m3 of gas per day, what is the average annual emission of sulfur in g per household?
Nitrous acid is produced when nitrogen dioxide dissolves in water to produce acid rain. What is the correct Lewis structure for nitrous acid?
Hydroxyl free radicals are thought to be involved in complex reactions converting sulfur dioxide into sulfur trioxide in the atmosphere.
OH• + SO2 → •HOSO2
•HOSO2 + O2 → •HO2 + SO3
Which is true?
OH• is catalytic
•HOSO2 contains 24 electrons
Both reactions are redox
The first reaction is exothermic
Iron structures can be damaged by dry deposition such as the equation below:
Fe (s) + SO2 (g) + O2 (g) → FeSO4 (s)
Given that,
ΔHf Ө (SO2) = -297 kJ mol-1
ΔHfӨ (FeSO4)= -929 kJ mol-1
What is the enthalpy change for this reaction?
-297 - 929
297 + 929
-297 + 929
297 - 929
Acid deposition results in leaching of aluminium ions from the soil. Which are true?
I and II only
I and III only
II and III only
I, II and III
The equilibrium constants for the dissociation of nitrous and sulphurous acid found in acid rain are as follows:
HNO2 (aq) ⇌ H+ (aq) + NO2- (aq) Kc1 = 7.2 10-4 mol dm-3
H2SO3 (aq) ⇌ H+ (aq) + HSO3- (aq) Kc2 = 1.3 10-2 mol dm-3
Which is true?
|
Stronger acid |
Effect on Kc of mixing the same volume and concentration the acids |
A |
Nitrous |
No effect |
B |
Sulfurous |
No effect |
C |
Nitrous |
Kc2 decreases |
D |
Sulfurous |
Kc1 decreases |
How many different types of ions can be found in acid rain, assuming it contains a mixture of sulfuric, sulfurous, nitric and nitrous acids?
4
5
6
7
Historic buildings and statues have frequently suffered chemical corrosion from acid rain. Which building materials would be unaffected by this?
Marble
Limestone
Granite
Lime Mortar
Which is true about the hydrogensulfate ion, HSO4-, found in acid rain?
I and II only
I and III only
II and III only
I, II and III