POST UTME LAUTECH 2018 Chemistry | Objective

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Question 1
At 298 K, the rate cons\tant of a reaction is 1.5 x 10^-3 s^-1. If the temperature is raised to 308 K, what is the new rate cons\tant?
A. 2.5 x 10^-3 s^-1
B. 3.0 x 10^-3 s^-1
C. 4.0 x 10^-3 s^-1
D. 5.0 x 10^-3 s^-1
Question 2
A sample of a polymer has a molecular weight of 100,000 g/mol. If the polymer is composed of 80% monomer A and 20% monomer B, what is the average molecular weight of the polymer?
A. 80,000 g/mol
B. 90,000 g/mol
C. 100,000 g/mol
D. 110,000 g/mol
Question 3
Determine the number of moles of oxygen gas (O2) that react with 2.5 moles of carbon monoxide (CO) in the following reaction: 2CO + O2 → 2CO2. Assume ideal gas behavior and a temperature of 298 K.
A. 1.25 moles
B. 2.5 moles
C. 3.75 moles
D. 5 moles
Question 4
What is the major product of the reaction between ethene and HCl?
A. CH3CH2Cl
B. CH3CH2CH2Cl
C. CH3CHClCH3
D. CH3CH2CH2CH2Cl
Question 5
A sample of a gas occupies 250 mL at 25°C and 1 atm. What is the volume of the gas at 50°C and 2 atm?
A. 125 mL
B. 250 mL
C. 500 mL
D. 1000 mL
Question 6
A solution of copper(II) sulfate is electrolyzed u\sing a copper electrode. What is the result of the electrolysis?
A. Deposition of copper
B. Oxidation of copper
C. Reduction of copper ions
D. No reaction occurs
Question 7
A 2.0 L flask contains 0.50 M H2SO4. What is the concentration of H+ ions in the solution?
A. 0.25 M
B. 0.50 M
C. 0.75 M
D. 1.0 M
Question 8
A sample of nitrogen gas (N2) is collected over water at a temperature of 25°C and a pressure of 1 atm. If the vapor pressure of water at 25°C is 0.0316 atm, calculate the partial pressure of nitrogen gas.
A. 0.9684 atm
B. 0.9694 atm
C. 0.9704 atm
D. 0.9714 atm
Question 9
A 2.5 g sample of an organic compound is burned in a combustion calorimeter. The heat of combustion is 12.5 kJ/g. Calculate the heat of combustion of 5.0 g of the compound.
A. 62.5 kJ
B. 62.8 kJ
C. 63.1 kJ
D. 63.5 kJ
Question 10
A solution contains 0.1 M NaOH and 0.1 M HCl. What is the pH of the resulting solution?
A. 0
B. 1
C. 2
D. 3
Question 11
A 1.0 M solution of hydrochloric acid (HCl) is prepared by dissolving 36.5 g of HCl in 1.0 L of water. Calculate the pH of the solution.
A. 0.5
B. 1.0
C. 1.5
D. 2.0
Question 12
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 13
A 10% solution of sulfuric acid (H2SO4) is mixed with a 20% solution of sodium hydroxide (NaOH) in a 1:1 ratio by volume. What is the resulting concentration of the mixture?
A. 15% H2SO4
B. 15% NaOH
C. 30% H2SO4
D. 30% NaOH
Question 14
A 10 mL sample of 0.5 M H2SO4 is added to 20 mL of 0.2 M NaOH. Calculate the concentration of the resulting solution.
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 15
A 2.5 M solution of sodium chloride (NaCl) is diluted to a volume of 5.0 L. What is the resulting concentration of the solution?
A. 0.5 M
B. 1.0 M
C. 1.25 M
D. 2.5 M

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