POST UTME UI 2018 Chemistry | Objective

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Question 1
A 2.00 L flask contains 0.500 mol of an ideal gas at 298 K. Calculate the number of moles of gas present u\sing the ideal gas law.
A. 0.250 mol
B. 0.250 mol
C. 0.250 mol
D. 0.250 mol
Question 2
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 20.0 mL of NaOH?
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 3
A solution containing 1.00 g of glu\cose is mixed with 100 mL of water. What is the molarity of the resulting solution?
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 4
A 2.50 L flask contains 0.500 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 x 10^3 Pa
B. 1.01 x 10^3 Pa
C. 1.01 x 10^3 Pa
D. 1.01 x 10^3 Pa
Question 5
A 2.00 L flask contains 0.500 mol of an ideal gas at 25°C. Calculate the number of moles of gas that must be added to the flask to increase the pressure by a factor of 2.
A. 0.250 mol
B. 0.500 mol
C. 0.750 mol
D. 1.00 mol
Question 6
The electrolysis of a solution of sodium chloride (NaCl) produces ______ and ______.
A. hydrogen and chlorine
B. sodium and chlorine
C. hydrogen and sodium
D. chlorine and sodium
Question 7
A 2.00 L flask contains a gas at 2.00 atm and 25°C. What is the pressure of the gas in a 1.00 L flask at 25°C?
A. 1.00 atm
B. 2.00 atm
C. 3.00 atm
D. 4.00 atm
Question 8
A 50.0 mL sample of a solution containing 0.500 M HCl is titrated with 0.100 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 50.0 mL
B. 50.0 mL
C. 50.0 mL
D. 50.0 mL
Question 9
A 1.00 M solution of NaOH is mixed with a 1.00 M solution of HCl. Calculate the pH of the resulting solution.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 10
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol.
A. -1206.60 kJ/mol
B. -1206.60 kJ/mol
C. -1206.60 kJ/mol
D. -1206.60 kJ/mol
Question 11
The atomic number of an element is equal to the number of ______ in its atomic nucleus.
A. protons
B. neutrons
C. electrons
D. photons
Question 12
A 2.00 g sample of a metal is heated in a crucible until it is completely oxidized. The mass of the resulting oxide is 4.00 g. What is the empirical formula of the metal?
A. Mg
B. Ca
C. Fe
D. Cu
Question 13
Determine the solubility of BaSO4 in 0.1M Na2SO4 solution at 25°C, given that the solubility product cons\tant (Ksp) of BaSO4 is 1.1 × 10^\( -10 \).
A. 1.0 × 10^\( -3 \) M
B. 1.0 × 10^\( -4 \) M
C. 1.0 × 10^\( -5 \) M
D. 1.0 × 10^\( -6 \) M
Question 14
A 0.50M solution of HCl is mixed with a 0.25M solution of NaOH. What is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 15
The reaction between hydrogen peroxide (H2O2) and potassium permanganate (KMnO4) is an example of a ______ reaction.
A. redox
B. acid-base
C. precipitation
D. neutralization

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