POST UTME LAUTECH 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
What is the major product of the reaction between ethene and HCl?
A. CH3CH2Cl
B. CH3CH2CH2Cl
C. CH3CHClCH3
D. CH3CH2CH2CH2Cl
Question 2
A 2.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. What is the resulting pH?
A. 1
B. 2
C. 3
D. 4
Question 3
The reaction of sodium with water is a classic example of a redox reaction. Identify the type of redox reaction that occurs when sodium reacts with water.
A. Oxidation of sodium
B. Reduction of water
C. Oxidation of water and reduction of sodium
D. Reduction of sodium and oxidation of water
Question 4
A solution of 0.1 M NaCl is prepared by dissolving 0.1 g of NaCl in 100 mL of water. Calculate the molarity of the solution.
A. 0.01 M
B. 0.1 M
C. 1.0 M
D. 10 M
Question 5
A sample of 2.0 g of a polymer is dissolved in 100 mL of a solvent. The solution is then diluted to 500 mL. Calculate the molarity of the solution.
A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M
Question 6
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 7
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 8
A 10.0 g sample of sulfur (S8) is burned in oxygen gas (O2) to produce sulfur dioxide (SO2). If the reaction is complete and the molar mass of sulfur is 32.1 g/mol, what is the volume of oxygen gas required to react with the sulfur?
A. 2.5 L
B. 5.0 L
C. 7.5 L
D. 10.0 L
Question 9
Determine the number of moles of glu\cose (C6H12O6) that can be obtained from 250g of a 30% glu\cose solution.
A. 0.5 mol
B. 1.0 mol
C. 1.5 mol
D. 2.0 mol
Question 10
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 11
A 5.0 L flask contains 0.20 M NaOH. What is the concentration of OH- ions in the solution?
A. 0.10 M
B. 0.20 M
C. 0.30 M
D. 0.40 M
Question 12
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 13
A 25 mL sample of 0.5 M NaOH is added to 50 mL of 0.1 M HCl. Calculate the concentration of the resulting solution.
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 14
A 10g sample of a polymer is dissolved in 100 mL of a solvent. What is the concentration of the polymer solution in g/L?
A. 10 g/L
B. 20 g/L
C. 30 g/L
D. 40 g/L
Question 15
A sample of 1.0 g of a biomolecule is dissolved in 100 mL of a solvent. The solution is then diluted to 500 mL. Calculate the molarity of the solution.
A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M

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