POST UTME CRAWFORD UNIVERSITY 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The reaction between sodium hydroxide (NaOH) and acetic acid (CH3COOH) is a neutralization reaction. What is the products of the reaction?
A. NaOH + CH3COOH \rightarrow NaCH3COO + H2O
B. NaOH + CH3COOH \rightarrow NaOH + CH3COOH
C. NaOH + CH3COOH \rightarrow NaCH3COO + H2O + CO2
D. NaOH + CH3COOH \rightarrow NaOH + CH3COOH + H2O
Question 2
A 2.5 g sample of an organic compound containing only carbon and hydrogen is combusted in a bomb calorimeter. The heat of combustion is 12.5 kJ/g. What is the empirical formula of the compound?
A. CH2
B. C2H4
C. C3H6
D. C4H8
Question 3
A metal M has a density of 9.0 g/cm^3 and a molar mass of 60.0 g/mol. Calculate the volume of 1.00 mol of M.
A. 1.67 cm^3
B. 2.00 cm^3
C. 3.33 cm^3
D. 4.00 cm^3
Question 4
A solution of sodium chloride is prepared by dissolving 35.5 g of sodium chloride in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 5
A sample of a gas at 25°C and 1 atm is found to have a volume of 2.5 L. What is the number of moles of the gas present in the sample?
A. 0.05 mol
B. 0.1 mol
C. 0.2 mol
D. 0.5 mol
Question 6
A solution of sodium chloride is prepared by dissolving 35.5 g of sodium chloride in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 7
A 1.00 M solution of H2SO4 is mixed with a 1.00 M solution of NaOH. Calculate the concentration of the resulting solution.
A. 0.50 M
B. 1.00 M
C. 1.50 M
D. 2.00 M
Question 8
A 2.50 g sample of a non-metallic oxide is heated in a stream of carbon monoxide gas. The resulting gas is collected and found to have a volume of 2.00 L at 25°C and 1.00 atm. What is the empirical formula of the oxide?
A. CO
B. CO2
C. C2O2
D. C3O3
Question 9
A 0.100 M solution of AgNO3 is mixed with a 0.100 M solution of NaCl. Calculate the concentration of AgCl(s) that precipitates.
A. 0.0100 M
B. 0.0200 M
C. 0.0300 M
D. 0.0400 M
Question 10
A 5.00-g sample of a metal is heated in a crucible until it is completely oxidized. The mass of the crucible and the oxide is 10.5 g. What is the identity of the metal?
A. Al
B. Fe
C. Cu
D. Zn
Question 11
A metal M has a density of 10.0 g/cm^3 and a molar mass of 80.0 g/mol. Calculate the volume of 1.00 mol of M.
A. 2.00 cm^3
B. 2.50 cm^3
C. 3.33 cm^3
D. 4.00 cm^3
Question 12
A 1.00 L sample of a gas at 25°C and 1.00 atm is collected over water. The vapor pressure of water at 25°C is 23.8 mmHg. What is the partial pressure of the gas?
A. 0.976 atm
B. 0.984 atm
C. 0.992 atm
D. 1.00 atm
Question 13
The element with atomic number 6 is _______.
A. C
B. N
C. O
D. F
Question 14
A 2.0 g sample of a metal oxide is heated in a stream of hydrogen gas at 1273 K. The resulting gas is passed through a solution of sodium hydroxide, and the volume of the gas collected at room temperature and pressure is 2.5 liters. What is the empirical formula of the metal oxide?
A. FeO
B. CuO
C. MgO
D. CaO
Question 15
A solution of sodium chloride is prepared by dissolving 35.5 g of sodium chloride in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M

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