POST UTME COVENANT UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Determine the hybridization of the carbon atom in the molecule CH3Cl, given that the bond angles are 109.5° and the C-Cl bond length is 1.75 Å.
A. sp3
B. sp2
C. sp
D. dsp3
Question 2
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the pH of the resulting solution is 7.00, what is the volume of NaOH added?
A. 12.5 mL
B. 25.0 mL
C. 37.5 mL
D. 50.0 mL
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. 0.100 M
B. 0.100 M
C. 0.100 M
D. 0.100 M
Question 4
A 2.00 g sample of a hydrocarbon is burned in oxygen to produce 3.00 g of CO2 and 1.00 g of H2O. What is the empirical formula of the hydrocarbon?
A. C2H4
B. C2H6
C. C3H6
D. C3H8
Question 5
A sample of nitrogen gas occupies a volume of 2.5 liters at a pressure of 1.5 atm. What is the volume of the gas at a pressure of 3.0 atm, assuming the temperature remains cons\tant?
A. 1.0 L
B. 1.5 L
C. 2.0 L
D. 2.5 L
Question 6
A solution contains 2.5 g of sodium chloride (NaCl) per 100 mL of water. What is the molarity of the solution?
A. 0.25 M
B. 0.50 M
C. 1.0 M
D. 2.0 M
Question 7
A 2.50 g sample of a non-metallic element is burned in oxygen to produce 2.00 g of CO2. What is the empirical formula of the element?
A. C2H4
B. C2H6
C. C3H6
D. C3H8
Question 8
The compound C6H12O6 is a carbohydrate. What type of carbohydrate is it?
A. Monosaccharide
B. Disaccharide
C. Polysaccharide
D. Amino sugar
Question 9
A diagram of a plant cell is shown below. What is the function of the cell wall?
A. To provide structural support
B. To regulate the movement of subs\tances
C. To produce energy
D. To synthesize proteins
Question 10
A metal can be extracted from its ore through electrolysis. What is the name of the process by which the metal is deposited at the cathode?
A. Electrolysis
B. Electroplating
C. Electrorefining
D. Electrosmelting
Question 11
A diagram of a titration setup is shown below. What is the purpose of the burette in the setup?
A. To measure the volume of the acid
B. To measure the volume of the base
C. To mix the acid and base
D. To measure the pH of the solution
Question 12
A redox reaction involves the transfer of electrons from one subs\tance to another. What is the name of the subs\tance that loses electrons?
A. Oxidizing Agent
B. Reducing Agent
C. Electron Donor
D. Electron Acceptor
Question 13
A 25.0 mL sample of a solution containing 0.100 M NaOH is titrated with 0.100 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 25.0 mL
B. 25.0 mL
C. 25.0 mL
D. 25.0 mL
Question 14
A metal M has a molar enthalpy of fusion of 10 kJ/mol. If 100 g of M is melted, what is the change in entropy?
A. +10 J/K
B. +20 J/K
C. +30 J/K
D. +40 J/K
Question 15
A redox reaction occurs between Fe2+ and MnO4- ions. If the reaction is carried out in acidic medium, what is the oxidation state of Mn in the product?
A. +2
B. +4
C. +6
D. +8

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