POST UTME LAUTECH 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
What is the primary function of the enzyme chitinase in the degradation of chitin?
A. Hydrolysis
B. Oxidation
C. Reduction
D. Decarboxylation
Question 2
A 1.0 M solution of a weak base B is mixed with a 0.5 M solution of a strong acid HCl. If the initial volume of the base solution is 100 mL and the initial volume of the acid solution is 50 mL, what is the pH of the resulting solution after the reaction is complete?
A. 2.5
B. 3.5
C. 4.5
D. 5.5
Question 3
A 10% solution of NaOH is prepared by dissolving 10 g of NaOH in 90 g of water. Calculate the molarity of the solution.
A. 0.1 M
B. 0.5 M
C. 1 M
D. 2 M
Question 4
The electronegativity of an element is a measure of its ability to attract electrons in a covalent bond. Which of the following elements has the highest electronegativity in the periodic table?
A. Fluorine
B. Oxygen
C. Nitrogen
D. Carbon
Question 5
A solution of hydrochloric acid (HCl) is prepared by dissolving 36.5 g of HCl in 100 mL of water. What is the concentration of the solution in terms of molality?
A. 1.0 m
B. 2.0 m
C. 3.0 m
D. 4.0 m
Question 6
A 2.5 L flask contains 0.2 M NaCl solution. Calculate the number of moles of NaCl present in the solution.
A. 0.1 mol
B. 0.2 mol
C. 0.5 mol
D. 1 mol
Question 7
A 2.50 M solution of HCl is titrated with a 1.00 M solution of NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the number of moles of HCl present in 100.0 mL of the HCl solution?
A. 0.250 mol
B. 0.500 mol
C. 0.750 mol
D. 1.00 mol
Question 8
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of combustion of 1.00 mol of C(s) at 298 K?
A. -393.5 kJ/mol
B. -393.5 kJ/g
C. -393.5 kJ/mol C
D. -393.5 kJ/mol O2
Question 9
A solution of sulfuric acid (H2SO4) is prepared by dissolving 98 g of H2SO4 in 100 mL of water. What is the concentration of the solution in terms of molality?
A. 1.0 m
B. 2.0 m
C. 3.0 m
D. 4.0 m
Question 10
A 0.1 M solution of a weak acid HA is mixed with a 0.2 M solution of a strong base NaOH. If the initial volume of the acid solution is 100 mL and the initial volume of the base solution is 200 mL, what is the pH of the resulting solution after the reaction is complete?
A. 3.5
B. 4.5
C. 5.5
D. 6.5
Question 11
A metal M has a s\tandard electrode potential of +1.0 V. If a cell is constructed with M as the anode and a s\tandard hydrogen electrode as the cathode, what is the cell potential?
A. -1.0 V
B. +1.0 V
C. +2.0 V
D. +3.0 V
Question 12
A 1.0 L flask contains 0.1 M HCl solution. Calculate the pH of the solution.
A. 1
B. 2
C. 3
D. 4
Question 13
A 1.00 M solution of HCl is titrated with a 1.00 M solution of NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the number of moles of HCl present in 100.0 mL of the HCl solution?
A. 0.100 mol
B. 0.250 mol
C. 0.500 mol
D. 1.00 mol
Question 14
A gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas?
A. 0.5 L
B. 1.0 L
C. 2.0 L
D. 4.0 L
Question 15
A 2.0 g sample of a non-metallic element is heated in a stream of oxygen gas. If 1.2 g of the element is converted to the oxide, what is the empirical formula of the oxide?
A. SO2
B. SO3
C. SO4
D. SO5

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