POST UTME AFE BABALOLA UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.5 L flask contains 0.3 mol of an ideal gas at 27°C. Calculate the pressure of the gas in pascals.
A. 101325 Pa
B. 202650 Pa
C. 303875 Pa
D. 405100 Pa
Question 2
A 10% solution of sodium chloride is prepared by dissolving 10 g of NaCl in 90 g of water. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 5 M
Question 3
A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 4
What is the major product of the reaction between 2-methylpropane and chlorine?
A. 2-chloro-2-methylpropane
B. 2,2-dichloro-2-methylpropane
C. 2-chloro-2-methyl-1-propane
D. 2-chloro-2-methyl-2-propane
Question 5
The reaction of zinc metal with copper(II) sulfate solution is a classic example of a redox reaction. Write the balanced chemical equation for this reaction, including the state of each subs\tance.
A. Zn + CuSO4 → ZnSO4 + Cu
B. Zn + CuSO4 → ZnSO4 + Cu2O
C. Zn + CuSO4 → ZnO + Cu
D. Zn + CuSO4 → ZnSO4 + CuSO3
Question 6
The diagram below shows the titration of a strong acid with a strong base. What is the pH of the solution after the equivalence point?
A. 7
B. 10
C. 12
D. 14
Question 7
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the pressure of the gas in pascals.
A. 101325 Pa
B. 202650 Pa
C. 303875 Pa
D. 405100 Pa
Question 8
Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g), given that the initial concentrations of NO and O2 are 0.5 M and 0.2 M, respectively, and the rate of reaction is 0.01 M/s after 10 minutes. The rate law is first order with respect to NO and second order with respect to O2.
A. 0.05 M^-1 s^-1
B. 0.1 M^-1 s^-1
C. 0.2 M^-1 s^-1
D. 0.5 M^-1 s^-1
Question 9
A 2.0 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the number of molecules of the gas.
A. 1.0 x 10^22
B. 2.0 x 10^22
C. 3.0 x 10^22
D. 4.0 x 10^22
Question 10
In the electrolysis of a solution of copper(II) sulfate, what is the primary product at the cathode?
A. Cu
B. Cu2+
C. H2
D. O2
Question 11
The following table shows the atomic radii of some elements in the periodic table. Identify the element with the largest atomic radius.
A. Group 1
B. Group 2
C. Group 17
D. Group 18
Question 12
The following diagram shows a setup for electrolysis of water. Identify the type of electrode used for the anode and the cathode.
A. Anode: Platinum, Cathode: Platinum
B. Anode: Iron, Cathode: Platinum
C. Anode: Platinum, Cathode: Iron
D. Anode: Iron, Cathode: Iron
Question 13
A solution contains 0.1 M sodium chloride (NaCl) and 0.2 M calcium chloride (CaCl2). Calculate the molarity of the chloride ions \( Cl- \) in the solution.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 14
The following diagram shows a setup for a chromatography experiment. Identify the subs\tance being separated.
A. Mixture of compounds
B. Single compound
C. Element
D. Mixture of elements
Question 15
The following diagram shows a setup for a titration experiment. Identify the subs\tance being titrated.
A. Acid
B. Base
C. Salt
D. Water

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