POST UTME RHEMA UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of 0.1 M NaCl is prepared by dissolving 0.01 mol of NaCl in 100 mL of water. What is the concentration of the solution in g/L?
A. 0.1 g/L
B. 1 g/L
C. 10 g/L
D. 100 g/L
Question 2
A 2.0 L sample of a solution containing 0.10 M NaOH is mixed with 1.0 L of a solution containing 0.20 M HCl. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 3
The enthalpy change for the reaction 2H2(g) + O2(g) → 2H2O(l) is -572 kJ/mol. What is the s\tandard enthalpy of formation of water?
A. -572 kJ/mol
B. -572 kJ/mol
C. -572 kJ/mol
D. -572 kJ/mol
Question 4
The element sulfur exists in several allotropes, including rhombic sulfur and monoclinic sulfur. What is the primary difference between these two allotropes?
A. Crystal structure
B. Density
C. Melting point
D. Boiling point
Question 5
The reaction between chlorine gas and sodium hydroxide solution is a classic example of a redox reaction. Write the balanced chemical equation for the reaction, including the state of each reac\tant and product.
A. 2NaOH(l) + Cl2(g) → NaCl(aq) + NaClO(aq) + H2O(l)
B. 2NaOH(l) + Cl2(g) → NaClO(aq) + NaCl(aq) + H2O(l)
C. 2NaOH(l) + Cl2(g) → NaClO3(aq) + NaCl(aq) + H2O(l)
D. 2NaOH(l) + Cl2(g) → NaCl(aq) + NaOH(aq) + H2O(l)
Question 6
A 500 mL sample of a solution containing 0.20 M HCl is titrated with 0.10 M NaOH. What is the pH of the solution after the titration?
A. 1
B. 2
C. 3
D. 4
Question 7
Determine the number of moles of glu\cose (C6H12O6) produced from the complete oxidation of 2.5 g of ethane (C2H6) according to the equation: C2H6 + 7/4 O2 → 2C6H12O6 + 3H2O. The molar mass of glu\cose is 180 g/mol.
A. 0.023 mol
B. 0.038 mol
C. 0.025 mol
D. 0.042 mol
Question 8
The diagram below shows a circuit with a battery, a resistor, and a capacitor. What is the function of the capacitor in this circuit?
A. to store energy
B. to filter out noise
C. to regulate voltage
D. to control current
Question 9
A 2.5 g sample of a polymer was dissolved in 100 mL of a solvent. The solution was then titrated with 0.1 M HCl. The volume of HCl required to reach the equivalence point was 20 mL. Calculate the molar mass of the polymer.
A. 500
B. 1000
C. 1500
D. 2000
Question 10
A 2.5 M solution of sodium hydroxide (NaOH) is titrated with 0.5 M hydrochloric acid (HCl). Calculate the volume of HCl required to reach the equivalence point.
A. 250 mL
B. 500 mL
C. 750 mL
D. 1000 mL
Question 11
A sample of hydrogen gas at 25°C and 1 atm is mixed with a sample of oxygen gas at 25°C and 1 atm. The resulting mixture is allowed to reach equilibrium. What is the partial pressure of oxygen in the mixture?
A. 0.5 atm
B. 1 atm
C. 1.5 atm
D. 2 atm
Question 12
A 2.5 g sample of sodium chloride (NaCl) is dissolved in 100 mL of water. What is the concentration of the resulting solution in molarity?
A. 0.2 M
B. 0.43 M
C. 0.6 M
D. 0.8 M
Question 13
A 1.5 g sample of sulfur (S) is heated in a crucible until it reaches a temperature of 1000°C. What is the mass of the resulting sulfur dioxide (SO2) gas?
A. 0.01 g
B. 0.018 g
C. 0.03 g
D. 0.05 g
Question 14
The reaction of nitrogen with oxygen to form nitrogen dioxide is represented by the equation: 4NO + O2 → 2N2O4. What is the mole ratio of NO to O2 in this reaction?
A. 1:1
B. 2:1
C. 4:1
D. 1:2
Question 15
The element chlorine is a ha\logen that exists in several allotropes, including molecular chlorine and chlorine gas. What is the primary difference between these two allotropes?
A. Molecular structure
B. Density
C. Melting point
D. Boiling point

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