POST UTME WELLSPRING UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
What is the major product of the reaction between 2-methylpropene and HCl?
A. 2-chloro-2-methylpropane
B. 2-chloro-2-methylbu\tane
C. 2-chloro-2-methylpen\tane
D. 2-chloro-2-methylhexane
Question 2
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 among the given options?
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Question 3
A sample of a non-metallic oxide, X2O3, has a mass of 25.0 g. If the molar mass of X2O3 is 224 g/mol, what is the number of moles of X2O3 present?
A. 0.11 mol
B. 0.12 mol
C. 0.13 mol
D. 0.14 mol
Question 4
A solution containing 0.1 M NaCl is prepared. If 10 mL of this solution is diluted to 100 mL, what is the concentration of the resulting solution?
A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M
Question 5
A solution of $NH_4Cl$ is prepared by dissolving $15.0,g$ of $NH_4Cl$ in $100,mL$ of water. Calculate the molarity of the solution.
A. 0.25 M
B. 0.50 M
C. 1.00 M
D. 2.00 M
Question 6
A $0.50,M$ solution of $CaCl_2$ is prepared by dissolving $29.7,g$ of $CaCl_2$ in $1.00,L$ of water. Calculate the molarity of the solution.
A. 0.25 M
B. 0.50 M
C. 1.00 M
D. 2.00 M
Question 7
A $1.00,M$ solution of $NaOH$ is prepared by dissolving $40.0,g$ of $NaOH$ in $1.00,L$ of water. Calculate the number of moles of $NaOH$ dissolved.
A. 0.0400 mol
B. 0.0800 mol
C. 0.120 mol
D. 0.160 mol
Question 8
What is the s\tandard enthalpy of formation of CO2(g) at 298 K?
A. -393.5 kJ/mol
B. -393.0 kJ/mol
C. -392.5 kJ/mol
D. -392.0 kJ/mol
Question 9
A 0.5 M solution of a strong acid HCl is titrated with 0.5 M NaOH. If 10 mL of NaOH is required to reach the equivalence point, what is the initial concentration of HCl?
A. 0.2 M
B. 0.3 M
C. 0.4 M
D. 0.5 M
Question 10
A 1.0 M solution of NaOH is prepared. If 20 mL of this solution is added to 50 mL of water, what is the concentration of the resulting solution?
A. 0.2 M
B. 0.4 M
C. 0.6 M
D. 0.8 M
Question 11
A sample of a metal (M) reacts with hydrochloric acid (HCl) to produce hydrogen gas (H2) and a salt (MCl2). The reaction is as follows: M + 2HCl → H2 + MCl2. If 2.5 g of M reacts with 10 mL of 2 M HCl, what is the molar mass of M?
A. \( M = \frac{2.5 \text{ g}}{2 \text{ mol}} \)
B. \( M = \frac{2.5 \text{ g}}{10 \text{ mL}} \)
C. \( M = \frac{10 \text{ mL}}{2 \text{ mol}} \)
D. \( M = \frac{2.5 \text{ g}}{10 \text{ mL}} \)
Question 12
Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g), given that the initial concentrations of NO and O2 are 0.1 M and 0.05 M, respectively, and the rate of reaction is 0.02 M/s after 10 minutes.
A. \( k = \frac{2.303}{t} \log left\( \frac{[NO]_0 [O_2]_0}{[NO_2]_t} \right \ \) )
B. \( k = \frac{2.303}{t} \log left\( \frac{[NO_2]_t}{[NO]_0 [O_2]_0} \right \ \) )
C. \( k = \frac{2.303}{t} \log left\( \frac{[NO]_0 [O_2]_0}{[NO_2]_t} \right \ \) )
D. \( k = \frac{2.303}{t} \log left\( \frac{[NO_2]_t}{[NO]_0 [O_2]_0} \right \ \) )
Question 13
A 10 mL sample of a solution containing 0.1 M NaOH is titrated with 0.1 M HCl. What is the volume of HCl required to reach the equivalence point?
A. 10 mL
B. 20 mL
C. 30 mL
D. 40 mL
Question 14
A $2.00,M$ solution of $NaOH$ is prepared by dissolving $40.0,g$ of $NaOH$ in $1.00,L$ of water. Calculate the number of moles of $NaOH$ dissolved.
A. 0.0400 mol
B. 0.0800 mol
C. 0.120 mol
D. 0.160 mol
Question 15
In the electrolysis of molten sodium chloride, what is the primary product formed at the cathode?
A. Sodium metal
B. Chlorine gas
C. Sodium chloride
D. Hydrogen gas

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