POST UTME BSU 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 10 g of glu\cose (C6H12O6) dissolved in 100 g of water. What is the molality of the solution?
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 2
A sample of a polymer, polyethylene, has a molecular weight of 200,000 g/mol. If 0.500 g of the polymer is dissolved in 50.0 mL of chloroform, calculate the molarity of the solution.
A. 0.010 M
B. 0.050 M
C. 0.100 M
D. 0.200 M
Question 3
A solution contains 0.100 M NaCl. If 25.0 mL of this solution is diluted to 250 mL, what is the concentration of the resulting solution?
A. 0.010 M
B. 0.050 M
C. 0.100 M
D. 0.200 M
Question 4
A 2.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. What is the concentration of the resulting solution?
A. 1.0 M
B. 2.0 M
C. 3.0 M
D. 4.0 M
Question 5
A metal oxide, M2O3, has a molar mass of 228 g/mol. If 2.5 g of the oxide is dissolved in water, what is the concentration of the resulting solution in moles per liter?
A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M
Question 6
A 2.0 L sample of a gas at 25°C and 1 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 mmHg, calculate the partial pressure of the gas.
A. 760 mmHg
B. 736 mmHg
C. 712 mmHg
D. 688 mmHg
Question 7
A metal oxide has the formula M2O3. What is the oxidation state of the metal?
A. +3
B. +4
C. +5
D. +6
Question 8
Determine the rate cons\tant (k) for the first-order reaction: A → B, given that the initial concentration of A is 0.1 M and the concentration of A after 10 minutes is 0.05 M. The rate cons\tant is related to the half-life \( t1/2 \) by the equation: k = ln(2) / t1/2.
A. 0.693 min^-1
B. 0.693 s^-1
C. 0.693 M^-1
D. 0.693 L mol^-1 s^-1
Question 9
A 1.0 L flask contains 0.1 mol of CO2 at 298 K. What is the partial pressure of CO2 in the flask?
A. 101.3 kPa
B. 50.65 kPa
C. 25.33 kPa
D. 12.67 kPa
Question 10
The reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl) is highly exothermic. Calculate the s\tandard enthalpy change \( ΔH^circ \) for the reaction, given that the s\tandard enthalpy of formation \( ΔH^circ_f \) for NaOH is -469 kJ/mol and for HCl is -92 kJ/mol.
A. -581 kJ/mol
B. -469 kJ/mol
C. -92 kJ/mol
D. 581 kJ/mol
Question 11
A diagram of a gas law setup is shown below. The pressure of the gas is 101.3 kPa, and the volume is 1.0 L. What is the temperature of the gas in Kelvin?
A. 298 K
B. 273 K
C. 373 K
D. 473 K
Question 12
A 1.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. What is the resulting concentration of the solution?
A. 1.0 M
B. 1.5 M
C. 2.0 M
D. 2.5 M
Question 13
A hydrocarbon has the molecular formula C3H6. What is the type of hydrocarbon?
A. Alkane
B. Alkene
C. Alkyne
D. Aromatic hydrocarbon
Question 14
A metal, X, has a density of 9.50 g/cm3 and a molar mass of 65.4 g/mol. If a 2.50 g sample of the metal is dissolved in acid, what volume of hydrogen gas is produced at 25°C and 1.00 atm?
A. 1.20 L
B. 2.40 L
C. 4.80 L
D. 6.00 L
Question 15
A sample of a polymer has a molecular weight of 100,000 g/mol. If the polymer is composed of 80% by mass of carbon (C) and 20% by mass of hydrogen (H), calculate the number of moles of carbon atoms in the polymer.
A. 8.0 x 10^22
B. 8.0 x 10^23
C. 8.0 x 10^24
D. 8.0 x 10^25

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