POST UTME CALEB UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The diagram below shows a setup for the electrolysis of water.
A. The anode is the cathode
B. The cathode is the anode
C. The electrolyte is water
D. The electrolyte is a strong acid
Question 2
The rate cons\tant for a first-order reaction is 1.5 min^-1. If the initial concentration of the reac\tant is 0.200 M, what is the concentration after 10.0 min?
A. 0.100 M
B. 0.150 M
C. 0.200 M
D. 0.250 M
Question 3
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. Calculate the pH of the solution after 10.0 mL of HCl has been added.
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 4
A 2.0 M solution of HCl is titrated with 1.0 M NaOH. If 20 mL of NaOH is added, what is the concentration of HCl remaining?
A. 1.8 M
B. 1.9 M
C. 2.0 M
D. 2.1 M
Question 5
A 1.0 M solution of NaOH is titrated with 1.0 M HCl. If 20 mL of HCl is added, what is the pH of the solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 6
A certain metal M has a s\tandard electrode potential of +0.5 V. If a cell is constructed with M as the anode and a s\tandard hydrogen electrode as the cathode, what is the s\tandard cell potential of the cell?
A. 0.5 V
B. -0.5 V
C. +1.0 V
D. -1.0 V
Question 7
A 2.5 L flask contains 0.5 mol of an ideal gas at a temperature of 298 K. What is the pressure of the gas in the flask?
A. 101.3 kPa
B. 102.5 kPa
C. 103.8 kPa
D. 105.1 kPa
Question 8
A polymer is formed by the condensation reaction between a diol and a diacid. If the molar mass of the diol is 90 g/mol and the molar mass of the diacid is 120 g/mol, what is the molar mass of the polymer formed?
A. 210 g/mol
B. 240 g/mol
C. 270 g/mol
D. 300 g/mol
Question 9
A sample of CO2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of water vapor is 0.02 atm, what is the mole \fraction of CO2?
A. 0.98
B. 0.99
C. 0.995
D. 0.996
Question 10
A 1.0 L sample of a gas at 25°C and 2.0 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of the gas?
A. 1.9
B. 1.95
C. 1.9762
D. 2.0
Question 11
A diagram of a titration setup is shown below. If 25 mL of 0.1 M HCl is required to reach the equivalence point, what is the concentration of the NaOH solution?
A. 0.1 M
B. 0.05 M
C. 0.01 M
D. 0.005 M
Question 12
A 1.00 L sample of a solution containing 0.100 M HCl and 0.0500 M NaOH is mixed with 2.00 L of water. Calculate the concentration of HCl in the resulting solution.
A. 0.0500 M
B. 0.0750 M
C. 0.100 M
D. 0.125 M
Question 13
A 3.0 g sample of a subs\tance is dissolved in 200 mL of water. If the molarity of the solution is 0.2 M, what is the molar mass of the subs\tance?
A. 300
B. 400
C. 600
D. 750
Question 14
A 2.0 M solution of HCl is titrated with 1.0 M NaOH. If 20 mL of NaOH is added, what is the concentration of HCl remaining?
A. 1.8 M
B. 1.9 M
C. 2.0 M
D. 2.1 M
Question 15
A 2.5 g sample of a non-metallic oxide is dissolved in 50 mL of 0.1 M HCl. The resulting solution is then titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the molar mass of the oxide?
A. 50 g/mol
B. 100 g/mol
C. 150 g/mol
D. 200 g/mol

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