POST UTME REDEEMERS UNIVERSITY 2025 Chemistry | Objective

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Question 1
A 2.50 g sample of a non-metallic oxide of nitrogen is dissolved in 50.0 cm³ of 0.100 M HCl. The reaction is as follows: NO_x + 2HCl → H_2O + xHCl. If 25.0 cm³ of 0.100 M NaOH is added to the solution, and the excess NaOH is titrated with 25.0 cm³ of 0.100 M HCl, calculate the value of x.
A. 1
B. 2
C. 3
D. 4
Question 2
A sample of a hydrocarbon has a molecular formula of C4H10. What is the name of this hydrocarbon?
A. Bu\tane
B. Isobu\tane
C. n-Bu\tane
D. Isobutene
Question 3
The reaction of acetic acid with sodium hydroxide is a classic example of a neutralization reaction. Write the balanced chemical equation for this reaction.
A. CH3COOH + NaOH → CH3COONa + H2O
B. CH3COOH + NaOH → CH3COONa + H2O2
C. CH3COOH + NaOH → CH3COONa + H2O3
D. CH3COOH + NaOH → CH3COONa + H2O4
Question 4
A 2.50 g sample of a non-metallic oxide of nitrogen is dissolved in 50.0 cm³ of 0.100 M HCl. The reaction is as follows: NO_x + 2HCl → H_2O + xHCl. If 25.0 cm³ of 0.100 M NaOH is added to the solution, and the excess NaOH is titrated with 25.0 cm³ of 0.100 M HCl, calculate the value of x.
A. 1
B. 2
C. 3
D. 4
Question 5
A reaction is said to be in equilibrium when the rates of the forward and reverse reactions are equal. What is the term for the equilibrium cons\tant that is used to describe the ratio of the concentrations of the products to the concentrations of the reac\tants?
A. Equilibrium cons\tant (K)
B. Reaction quotient (Q)
C. Thermodynamic equilibrium cons\tant (K)
D. Dynamic equilibrium cons\tant (K)
Question 6
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 20 mL of the HCl solution is required to reach the equivalence point, what is the volume of NaOH solution required to reach the equivalence point?
A. 10 mL
B. 20 mL
C. 30 mL
D. 40 mL
Question 7
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. What is the pressure of the gas in atm?
A. 1.0 atm
B. 2.0 atm
C. 3.0 atm
D. 4.0 atm
Question 8
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. If 0.25 mol of the gas is removed, what is the new pressure of the gas in the flask?
A. 0.5 atm
B. 0.75 atm
C. 1 atm
D. 1.5 atm
Question 9
The pH of a solution is a measure of its acidity or basicity. What is the pH of a solution that has a hydrogen ion concentration of 1.0 x 10^-5 M?
A. 5.0
B. 6.0
C. 7.0
D. 8.0
Question 10
The solubility of a subs\tance is defined as the maximum amount of the subs\tance that can dissolve in a given amount of solvent at a particular temperature. What is the term for the minimum amount of a subs\tance that must be present in a solution for the subs\tance to be considered soluble?
A. Critical concentration
B. Saturation point
C. Solubility limit
D. Minimum solubility
Question 11
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. If the gas is compressed to half its original volume, what is the new pressure of the gas in the flask?
A. 0.5 atm
B. 0.75 atm
C. 1 atm
D. 1.5 atm
Question 12
A 0.1 M solution of HCl is prepared by dissolving 2.5 g of HCl in 100 mL of water. What is the concentration of the solution in mol/L?
A. 0.069 M
B. 0.0695 M
C. 0.07 M
D. 0.07 M
Question 13
A sample of a hydrocarbon has a molecular formula of C5H12. What is the name of this hydrocarbon?
A. Pen\tane
B. Isopen\tane
C. n-Pen\tane
D. Isopentene
Question 14
A sample of a polymer has a molecular weight of 50000 g/mol. If the degree of polymerization is 200, what is the molar mass of the repeating unit?
A. 250 g/mol
B. 500 g/mol
C. 750 g/mol
D. 1000 g/mol
Question 15
The compound H2S is formed by the reaction of hydrogen gas with sulfur. What is the oxidation state of sulfur in H2S?
A. 0
B. +2
C. -2
D. +4

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