POST UTME OSUSTECH 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 M solution of H2SO4 is mixed with 1.5 M solution of NaOH. Calculate the pH of the resulting solution.
A. 1.2
B. 1.5
C. 1.8
D. 2.1
Question 2
A metal oxide, M2O3, is reduced to its corresponding metal, M, by heating it in a stream of hydrogen gas. The reaction is as follows: M2O3 + 3H2 → 2M + 3H2O. If 2.50 g of M2O3 is heated in a stream of hydrogen gas, and 1.50 g of water is collected, what is the percentage yield of the reaction?
A. 50%
B. 60%
C. 70%
D. 80%
Question 3
A 2.00 L flask contains 0.500 mol of an ideal gas at 50°C. Calculate the pressure of the gas in atm.
A. 1.00 atm
B. 1.01 atm
C. 1.02 atm
D. 1.03 atm
Question 4
A metal (M) reacts with chlorine gas to form a white solid. The reaction is as follows: \[ \text{M} + \text{Cl}_2 \rightarrow \text{MCl}_2 \]. If 2.5 g of MCl_2 is produced from 1.5 g of M, what is the molar mass of M?
A. 20 g/mol
B. 30 g/mol
C. 40 g/mol
D. 50 g/mol
Question 5
A 1.00 L sample of a gas at 25°C and 1.00 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. 760 mmHg
B. 737 mmHg
C. 760 - 23.8 mmHg
D. 760 mmHg
Question 6
A 2.0 M solution of HCl is mixed with 1.0 M solution of NaOH. Calculate the concentration of H2O formed.
A. 1.0 M
B. 1.5 M
C. 2.0 M
D. 2.5 M
Question 7
A sample of nitrogen gas (N2) is collected over water at a temperature of 25°C and a pressure of 1.00 atm. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of the nitrogen gas?
A. 0.968 atm
B. 0.975 atm
C. 0.982 atm
D. 0.989 atm
Question 8
The s\tandard reduction potential of the Cu2+/Cu couple is +0.34 V. What is the s\tandard cell potential for a cell consisting of a Cu2+/Cu couple in the anode and a Zn2+/Zn couple in the cathode?
A. +0.10 V
B. +0.34 V
C. +0.44 V
D. +0.54 V
Question 9
A 1.00 L sample of a gas at 25°C and 1.00 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. 760 mmHg
B. 737 mmHg
C. 760 - 23.8 mmHg
D. 760 mmHg
Question 10
A diagram of a titration setup is shown below. If the burette contains 0.1 M HCl and the flask contains 25 mL of 0.1 M NaOH, what is the volume of HCl required to reach the equivalence point?
A. 10 mL
B. 20 mL
C. 30 mL
D. 40 mL
Question 11
A mixture of 2.50 g of sodium chloride (NaCl) and 1.50 g of glu\cose (C6H12O6) is dissolved in 100 mL of water. Calculate the molality of the solution.
A. 0.10 m
B. 0.20 m
C. 0.30 m
D. 0.40 m
Question 12
A 2.50-g sample of a compound containing only carbon and hydrogen is burned in oxygen to produce 3.00 L of CO2 at 273.15 K and 1.00 atm. What is the empirical formula of the compound?
A. CH
B. C_2H_2
C. C_2H_4
D. C_2H_6
Question 13
A 1.5 M solution of FeCl3 is mixed with 2.5 M solution of NaOH. Calculate the concentration of Fe(OH)3 formed.
A. 0.75 M
B. 1.0 M
C. 1.25 M
D. 1.5 M
Question 14
The polymerization of styrene to polystyrene is an example of a ______ reaction.
A. chain reaction
B. step-growth reaction
C. condensation reaction
D. addition reaction
Question 15
The rate of a chemical reaction is affected by the ______ of the reac\tants.
A. concentration
B. temperature
C. pressure
D. volume

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