POST UTME OSUSTECH 2020 Chemistry | Objective

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Question 1
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 2
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 3
Calculate the number of moles of HCl required to react with 2.50 g of CaO to form CaCl2 and H2O.
A. 0.0500 mol
B. 0.100 mol
C. 0.200 mol
D. 0.500 mol
Question 4
The rate of a chemical reaction is affected by the ______ of the reac\tants.
A. concentration
B. temperature
C. pressure
D. volume
Question 5
A 2.5 M solution of HCl is titrated with a 0.5 M solution of NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 6
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 7
The reaction of benzene with bromine in the presence of light is an example of a ______ reaction.
A. substitution reaction
B. elimination reaction
C. addition reaction
D. oxidation reaction
Question 8
A solution containing 0.1 M HCl is mixed with a solution containing 0.1 M NaOH. If 25 mL of the HCl solution is added to 25 mL of the NaOH solution, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 9
A 0.1 M solution of a monoprotic acid is titrated with a 0.1 M solution of a strong base. If 25 mL of the base is required to reach the equivalence point, what is the number of moles of acid initially present?
A. 0.0025 mol
B. 0.005 mol
C. 0.0075 mol
D. 0.01 mol
Question 10
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 11
A solution of sodium hydroxide (NaOH) is titrated with a solution of hydrochloric acid (HCl). If 25.0 mL of 0.100 M NaOH is required to neutralize 25.0 mL of 0.100 M HCl, what is the concentration of the HCl solution?
A. 0.100 M
B. 0.200 M
C. 0.500 M
D. 1.00 M
Question 12
What is the molarity of a solution containing 15.0 g of NaCl in 250 mL of water?
A. 0.10 M
B. 0.20 M
C. 0.30 M
D. 0.40 M
Question 13
The s\tandard Gibbs free energy change for the reaction 2Ag+ + 2e- → 2Ag(s) is -0.80 V. Calculate the equilibrium cons\tant (K) for this reaction at 298 K.
A. 1.4 × 10^6
B. 1.4 × 10^5
C. 1.4 × 10^3
D. 1.4 × 10^2
Question 14
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 15
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

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