POST UTME FUTA 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A metal (M) reacts with chlorine gas to form a white solid. The reaction is as follows: M + Cl_2 → MCl_2. If 2.5 g of M reacts with 1.5 g of Cl_2, what is the percentage yield of MCl_2 if the theoretical yield is 4.2 g?
A. 60%
B. 70%
C. 80%
D. 90%
Question 2
The reaction of phenol with sodium hydroxide in the presence of heat produces a mixture of sodium phenoxide and water. What is the major product of this reaction?
A. sodium phenoxide
B. water
C. phenol
D. sodium hydroxide
Question 3
A 1.0 M solution of NaOH is titrated with 0.5 M HCl. What is the pH of the solution after 20 mL of HCl has been added?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 4
Calculate the s\tandard enthalpy of formation of CO2(g) from the following data: ΔH°f(CO2(g)) = -393.5 kJ/mol, ΔH°f(C) = 0 kJ/mol, ΔH°f(O2(g)) = 0 kJ/mol.
A. -393.5 kJ/mol
B. -393.5 kJ/mol + 0 kJ/mol
C. -393.5 kJ/mol + 0.5 kJ/mol
D. -393.5 kJ/mol + 0.5 kJ/mol + 0 kJ/mol
Question 5
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 0.2 M, respectively, and the rate of reaction is 0.05 M/s after 10 minutes.
A. \( k = \frac{2.303}{t} \log \frac{[NO]_0 [O_2]_0}{[NO_2]_t} \)
B. \( k = \frac{2.303}{t} \log \frac{[NO_2]_t}{[NO]_0 [O_2]_0} \)
C. \( k = \frac{2.303}{t} \log \frac{[NO]_0 [O_2]_0}{[NO_2]_t} \)
D. \( k = \frac{2.303}{t} \log \frac{[NO_2]_t}{[NO]_0 [O_2]_0} \)
Question 6
A 0.500 M solution of HCl is mixed with a 0.500 M solution of NaOH. What is the concentration of the resulting solution?
A. 0.500 M
B. 1.000 M
C. 0.250 M
D. 0.750 M
Question 7
The reaction of sodium nitrite with acetic acid in the presence of sulfuric acid produces a mixture of nitrous acid and acetic anhydride. What is the major product of this reaction?
A. nitrous acid
B. acetic anhydride
C. nitric acid
D. nitrogen gas
Question 8
Determine the number of moles of CO2 produced from the complete combustion of 2.5 g of propane (C3H8) according to the equation: C3H8 + 5O2 → 3CO2 + 4H2O.
A. 0.25 mol
B. 0.5 mol
C. 0.75 mol
D. 1.0 mol
Question 9
Determine the pH of a 0.1 M solution of HCN (hydrocyanic acid) at 25°C, given that the dissociation cons\tant \( K_a \) of HCN is 6.2 × 10^-10.
A. 3.5
B. 4.5
C. 5.5
D. 6.5
Question 10
A 2.5 g sample of a metal is heated in a crucible until it reaches a temperature of 1000°C. Calculate the energy required to heat the metal.
A. 1000 J
B. 2000 J
C. 3000 J
D. 4000 J
Question 11
A 1.0 L flask contains 0.5 mol of an ideal gas at a pressure of 1 atm. If the gas is compressed to a volume of 0.5 L, what is the new pressure of the gas?
A. 2 atm
B. 4 atm
C. 6 atm
D. 8 atm
Question 12
A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the resulting pH?
A. 1
B. 2
C. 3
D. 4
Question 13
The reaction of cyclohexane with bromine in the presence of light produces a mixture of cyclohexyl bromide and a dibromocyclohexane. The major product is the one that is formed by the attack of bromine at the most substituted carbon atom. What is the major product of this reaction?
A. 1-bromocyclohexane
B. trans-1,2-dibromocyclohexane
C. cis-1,2-dibromocyclohexane
D. trans-1,4-dibromocyclohexane
Question 14
A 1.5 M solution of HCl is titrated with 0.5 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 15
The reaction between CH_4 and Cl_2 is first-order with respect to CH_4 and second-order with respect to Cl_2. If the initial concentration of CH_4 is 0.1 M and the initial concentration of Cl_2 is 0.2 M, what is the rate of reaction after 10 minutes?
A. 0.02 M/min
B. 0.04 M/min
C. 0.06 M/min
D. 0.08 M/min

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