SAMPLE MULTIPLE CHOICE QUESTIONS FOR OAC EXAM PREPARATION
PAPER ONE
1.
What element do all organic compounds contain?
A) C
2.
B) H
D) Fe
Which of the following is a product of all condensation reactions?
A) H2O
3.
C) O
B) esters C) Pb
D) acid rain
Which of the following all contain a carbonyl group?
A) alkanes, alkenes, alkynes
B) alcohols, carboxylic acids, ethers
C) aldehydes, ketones, amines
D) carboxylic acids, aldehydes, ketones
4.
Which of the following would react to form pentylethanoate?
A)
C)
5.
1-pentanol and ethanoic acid
1-propanol and pentanoic acid
ethanol and pentanoic acid
ethanol and ethanoic acid
To what Organic Family does the follwing molecule belong?
H
C
C
A) alcohol
6.
B)
D)
H
B) alkyne
C) ether
D) carboxylic acid
To what Organic Family does the follwing molecule belong?
CH2=CH-CH3
A) alcohol
7.
D) carboxylic acid
B) (4,0,0,1/2)
C) (3,2,2,1/2)
D) (3,2,-2,-1/2)
Fluorine and chlorine are gases, bromine is a liquid and iodine is a solid at room temperature.
In which element are van der Waals forces greatest between the molecules?
A)
9.
C) alkene
Which of the following describes a 4p electron?
A) (4,1,0,1/2)
8.
B) alkyne
iodine
B)
bromine
Which of the following are all forms of carbon?
A) diamond, graphite, buckyballs
B) diamond, sapphire, graphite
C) asbestos, diamond, buckyballs
D) diamond, graphite, soccerballs
C)
chlorine
D)
fluorine
10.
Consider the following reactions:
1)
H2(g) + 1/2O2(g) ---> H2O(g) H = -243 kJ/mol
2)
1/2N2(g) + 1/2O2(g) + 90.7 kJ --->NO(g)
3)
C(s) + 1/2O2(g) ---> CO(g) + 111 kJ
4)
1/2H2(g) + 1/2I2(g) ---> HI(g) H = 26 kJ/mol
Which of the above reactions is endothermic?
A) 1 and 2
B)
1 and 4
C)
1 and 3
D)
2 and 4
Questions 11 & 12 refer to the following reaction sequence:
11.
1)
W + XY ---> WX + Y
fast
2)
W + WX ---> W2X
very fast
3)
W2X + Z ---> WXZ + W
slow
4)
WXZ + Z ---> WXZ2
fast
Which step is the rate-determining step?
A)
12.
13.
1
B)
2
C)
3
D)
4
Which of the following rate law expressions would support the above mechanism?
2
A) r = k[W2X] [Z]
B) r = k[W]
C) r = k[WXZ] [Z]
D) r = k[W] [XY]
2
Consider the following reactions:
1)
2)
Na+(aq) + Cl-(aq) ---> NaCl(s)
C(s) + O2(g) ---> CO2(g)
Which statement below best describes the relative rates of the two reactions?
A) 2 is faster than 1
C) 1 is faster than 2
B) 1 and 2 are both slow
D) 1 and 2 are both fast
FOR QUESTIONS 14 & 15, CONSIDER THE FOLLOWING ENERGY DIAGRAM FOR THE
REACTION : X + Y ----> Z:
14.
Which area corresponds to the activated complex for the reaction?
A) A
15.
C) E
D) D
What is the energy of the products ?
A) A
16.
B) B
B) B
C) C
D) D
When a mixture of potassium chlorate and an appropriate catalyst is heated in an open test tube,
potassium chloride and oxygen gas are produced. Why is this not an equilibrium system?
A) the oxygen gas escapes B) the system is closed
C) the reaction is exothermic
D) the reaction is reversible
17.
Why is equilibrium said to be dynamic?
A) the forward and reverse reaction are always occurring
B) the colour of the reaction mixture never changes
C) heat is always given off
D) a catalyst is always used
18.
What do increases in temperature tend to do to equilibrium systems?
A) shift the reaction in favour of the exothermic process
B) shift the reaction in favour of the endothermic process
C) shift the reaction to favour the side with fewer gas molecules
D) have no effect on an equilibrium system
19.
Consider the following reaction:
N2 (g) + 3 H2 (g) <---> 2 NH3 (g)
What will be observed if the volume of the reaction flask is decreased?
A) pressure will decrease
C) amount of N2 will increase
20.
21.
B) amount of NH3 will increase
D) no change will be noted
The value for Kc for a reaction is found to be 3.2 x 10
reaction?
-15
A) products are favoured
C) reactant concentration = product concentration
B) reactants are favoured
D) the system was open
. What does this imply about the
Consider the following reactions:
1)
CO2(g) <---> CO2(s)
2)
H2O(l) <---> H2O(g)
3)
2 NO(g) + O2(g) <---> 2 NO2(g)
4)
H2O(g) <---> H2O(l)
In which of the above reactions does the tendency towards maximum entropy favour reactants?
A) 1 and 3
22.
B) 1 and 4
C) 1 , 3 and 4
D) 2 only
Consider the following the following reaction:
A (aq) + 2B (aq) ---> C (aq)
Kc for the reaction is 1/32 . At equilibrium, [A] = 2.0 mol/L and [C] = 1.0 mol/L. What is the
[B]?
A) 4.0 mol/L
23.
B) 16 mol/L
C) 2.0 mol/L
D) 0.50 mol/L
Consider the following reaction:
HSO4- + H2O ---> H3O+ + SO4-2
Which substance behaves as a Bronsted-Lowry base?
A)
24.
HSO4-
B)
H2 O
C)
Consider the following information:
SUBSTANCE
Ksp
AgBr
7.7 x 10-13
AgCl
1.6 x 10-10
H3 O+
D)
SO4-2
AgOH
2.0 x 10-6
AgI
1.5 x 10-22
Which of the above substances is MOST soluble?
A)
25.
AgBr
B)
AgCl
C)
AgOH
D)
AgI
-5
The Ksp for MgCO3 is 2.5 x 10 . Equal volumes of the following solutions are mixed:
1) 0.002 mol/L Mg
+2
and 0.0002 mol/L CO3-2
2) 0.002 mol/L Mg
+2
and 0.002 mol/L CO3-2
+2
and 0.02 mol/L CO3-2
4) 0.20 mol/L Mg+2 and 0.20 mol/L CO -2
3) 0.02 mol/L Mg
3
In which of the above mixtures will a precipitate form?
A)
B)
C)
D)
26.
all of the above
1 and 2 only
2 ,3 and 4 only
3 and 4 only
-
An aqueous solution has a OH concentration of 0.25 mol/L. What is the pH of the solution?
A) -1.0
27.
B) 0.60
C) 1.0
What does reduction involve?
A) loss of electrons
C) gain of electrons
28.
+6
B)
+7
C)
-7
D)
-4
Which of the following is a conjugate base for HSO4- ?
A) SO4-2
30.
B) loss of protons
D) gain of protons
What is the oxidation number of Mn in KMnO4 ?
A)
29.
D) 13.40
C) H3O+
B) H2SO4
D) OH-
Consider the following reaction:
+
PbO2 + Pb + 4 H ---> 2 Pb
+2
+ 2 H2O
Which substance is oxidized in the above reaction?
A)
31.
PbO2
B)
Pb
C)
H
+
D)
Pb
At standard conditions, which of the following is most easily reduced?
A)
Na
+
B)
+2
Sn
C)
Cl
D)
+
Ag
+2
32.
Consider the following half reactions:
Al+3 + 3e ---> Al
E = -1.71 V
Cu+ + e ---> Cu
E = +0.52 V
What is the E for the overall reaction given below?
+3
Al
A)
+ 3 Cu ---> Al + 3Cu
-2.23 V B)
+
-1.19 V C)
1.19 V D)
2.23 V
PAPER TWO
1.
Consider the following electron configurations:
2
i)
ii)
iii)
iv)
v)
2
2
1s 2s 3s
2
2
6
1s 2s 2p
2
2
6
1
s 2s 2p 3s
2
2
6
2
6
2
8
1s 2s 2p 3s 3p 4s 3d
2
2
6
2
6
2
10
6
1s 2s 2p 3s 3p 4s 3d 4p
Which configurations represent elements in the same group on the periodic table?
A)
C)
2.
If
iodine
B)
bromine
C)
chlorine
D)
B) 1
C) -1
fluorine
?
D) 2
What type of substance could melt at - 7.2 C and not conduct electricity in either the solid or
liquid state?
A)
C)
5.
i) and iv)
ii) and iii)
l = 1 , which of the following is not a possible value for m l
A) 0
4.
B)
D)
Fluorine and chlorine are gases, bromine is a liquid and iodine is a solid at room temperature. In
which element are van der Waals forces greatest between the molecules?
A)
3.
iv) and v)
ii) and v)
ionic crystal
B)
covalent network crystal D)
metallic crystal
molecular crystal
To what organic family does the following belong?
C
C
A) alkene
C
O
C
B)ether
C) carboxylic acid
D) ketone
6.
To what organic family does the following belong?
H
C
C
A) alkyne
7.
B)ether
C) aldehyde
D) ketone
What do saturated hydrocarbons contain?
A)
C)
8.
H
only C - C single bonds
only C - C multiple bonds
B)
D)
at least one multiple C - C bond
all the water they can hold
Consider the following reactions:
1)
H2(g) + 1/2O2(g) ---> H2O(g) H = -243 kJ/mol
2)
1/2N2(g) + 1/2O2(g) + 90.7 kJ --->NO(g)
3)
C(s) + 1/2O2(g) ---> CO(g) + 111 kJ
4)
1/2H2(g) + 1/2I2(g) ---> HI(g) H = 26 kJ/mol
Which of the above reactions is exothermic?
A) 1 and 2
B)
1 and 4
C)
1 and 3
D)
2 and 4
FOR QUESTIONS 9 & 10, CONSIDER THE FOLLOWING ENERGY DIAGRAM FOR THE
REACTION : X + Y ----> Z:
9.
Which area corresponds to the H for the reaction?
A) A
10.
B) B
D) D
C) C
D) D
Which area corresponds to the Ea ?
A) A
11.
C) C
B) B
Consider the following reaction mechanism:
1)
A ---> D + E
2)
D + B ---> C
3)
B + E ---> F
The overall reaction is:
SLOW
FAST
FAST
A +2B + 300kJ ---> C + F
How might the rate of the forward reaction be increased?
A)
C)
12.
increase [A]
decrease temperature
B)
D)
increase [B]
both A and B
The equation for the combustion of CH4 is:
CH4 (g) + 2O2(g) ---> CO2(g) + H2O (g)
CH4 is consumed at a rate of 4.48 L/min at STP. How can the rate of reaction be
expressed?
A)
C)
8.96 L/min of O2
8.96 L/min of CO2
B)
D)
-8.96 L/min of O2
-8.96 L/min of CO2
13.
Consider the following reaction:
N2 (g) + 3 H2 (g) <---> 2 NH3 (g)
What will be observed if the volume of the reaction flask is decreased?
A) pressure will decrease
C) amount of N2 will increase
14.
15.
B) amount of NH3 will increase
D) no change will be noted
The value for Kc for a reaction is found to be 3.2 x 10
reaction?
-15
A) products are favoured
C) reactant concentration = product concentration
B) reactants are favoured
D) the system was open
. What does this imply about the
Consider the following reaction:
2 SO2(g) + O2(g) <---> 2 SO3(g) + 188 kJ
What will be observed if the temperature is increased?
A) [SO3] will increase
C) the pressure will decrease
16.
B) the formation of reactants will be favoured
D) no change will be noted
Consider the following reactions:
1)
CO2(g) <---> CO2(s)
2)
H2O(l) <---> H2O(g)
3)
2 NO(g) + O2(g) <---> 2 NO2(g)
4)
H2O(g) <---> H2O(l)
In which of the above reactions does the tendency towards maximum entropy favour reactants?
A)
C)
17.
18.
1 and 3
1 , 3 and 4
B)
D)
1 and 4
2 only
NH3 and CH3COOH solutions are mixed. Which of the following are a conjugate acid base pair?
A)
NH3 and CH3COOH
B)
NH4+ and NH3
C)
CH3COOH and NH4+
D)
NH3 and CH3COO-
Consider the following reaction:
HSO4- + H2O ---> H3O+ + SO4-2
Which substance behaves as a Bronsted-Lowry base?
A)
19.
H2 O
C)
H3 O+
D)
SO4-2
0.015
B)
0.085
C)
1.82
D)
2.18
What is the oxidation number of Cl in Cl2(g)?
A)
21.
B)
What is the pH of a 0.015 mol/L aqueous solution of HCl?
A)
20.
HSO4-
-1
B)
0
C)
+1
D)
+7
2)
4)
oxidation occurs at the anode
reduction occurs at the cathode
Consider the following statements:
1)
3)
oxidation occurs at the cathode
reduction occurs at the anode
Which is true of all electrochemical cells?
A) 1 & 3 B) 2 & 4
22.
C) 1 & 4
D) 2 & 3
Consider the following half reactions:
Al+3 + 3e ---> Al
E = -1.71 V
Cu+ + e ---> Cu
E = +0.52 V
What is the E for the overall reaction given below?
+3
Al
+ 3 Cu ---> Al + 3Cu
A)
-2.23 V B)
-1.19 V C)
23.
Consider the following reaction:
+
1.19 V D)
+
PbO2 + Pb + 4 H ---> 2 Pb
+2
2.23 V
+ 2 H2O
Which substance is the reducing agent in the above reaction?
A)
24.
B)
Pb
C)
H
+
D)
Pb
+2
In which of the does Cr have an oxidation number of +3?
A)
25.
PbO2
Cr2O8-2
B)
CrO2-2
C)
Consider the following half cell reactions:
Cl2 + 2e ---> 2 Cl-
Fe
+3
-
+ e ---> Fe
+2
E = 1.36 V
E = 0.77 V
Which of the following reactions may occur spontaneously?
Cr2O4-2
D)
CrSO4
26.
+2
---> 2 Cl + 2 Fe
-
+3
B)
Cl2 + 2 Fe
+3
---> 2 Cl + 2 Fe
-
+2
C)
2 Cl + 2 Fe
D)
2 Cl + 2 Fe
-
+3
---> Cl2 + 2 Fe
+2
-
+2
---> Cl2 + 2 Fe
+3
2-
2
2
6
2
4
1s 2s 2p 3s 3p
2
2
6
2
6
1s 2s 2p 3s 3p
2
2
6
2
6
1s 2s 2p 3s 3p 4s2
2
2
6
2
3
1s 2s 2p 3s 3p
In the HCl molecule, where are the bonding electrons located?
A)
B)
C)
D)
28.
Cl2 + 2 Fe
What is the electron configuration of the sulphide ion, S ?
A)
B)
C)
D)
27.
A)
closer to the chlorine than the hydrogen
centred between the two atoms
at opposite ends of the atoms
closer to the hydrogen than the chlorine
Which of the following is a macroscopic property?
A) the angle of a collision between molecules
C) the colour of NO2 gas
29.
B) the shape of a CO2 molecule
D) the vibration of a O---H bond
Consider the following reaction:
2 Fe2O3(s) <---> 4Fe(s) + 3 O2(g) H = 400 kcal
What will be observed if the pressure is decreased?
A)The endothermic reaction will be favoured
C)The exothermic reaction will be favoured
30.
B)[Fe2O3] will increase
D)no change will be noted
Consider the following the following reaction:
A (aq) + 2B (aq) ---> C (aq)
Kc for the reaction is 1/32 . At equilibrium, [A] = 2.0 mol/L and [C] = 1.0 mol/L. What is the
[B]?
A) 4.0 mol/L
ANSWERS
PAPER ONE:
B) 16 mol/L
C) 2.0 mol/L
D) 0.50 mol/L
1. A 2. A 3. D 4. A 5. B 6. C 7. A 8. A 9. A 10. Di 11. C 12. A 13. C 14. C 15.
D 16. A 17. A 18. B 19. B 20. B 21. C 22. A 23. B 24. C 25. D 26. D 27. C
28. B 29. A 30. B 31. C 32. A
PAPER TWO:
1. C 2. A 3. D 4. D 5 B 6. A 7. A 8.C 9. C 10. B 11. A 12. B 13. A 14. B 15. B
16. C 17. B 18. B 19. C 20. B 21. B 22. A 23. B 24. C 25. A 26. B 27. A 28. C
29. A 30. A