POST UTME RHEMA UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 25 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 2
A 1.0 L flask contains 0.50 M HCl. If 0.20 mol of NaOH is added to the flask, what is the resulting concentration of the solution?
A. 0.25 M
B. 0.50 M
C. 0.75 M
D. 1.0 M
Question 3
A solution contains 0.5 M NaCl and 0.2 M CaCl2. Calculate the total concentration of chloride ions in the solution.
A. 0.5 M
B. 1.0 M
C. 1.2 M
D. 1.5 M
Question 4
A 2.50 L sample of a gas at 298 K and 1.50 atm is compressed to 0.500 L at the same temperature. What is the new pressure of the gas?
A. 3.00 atm
B. 4.00 atm
C. 5.00 atm
D. 6.00 atm
Question 5
A sample of a gas has a volume of 2.0 L at a pressure of 1.0 atm and a temperature of 300 K. If the pressure is increased to 2.0 atm and the temperature is increased to 400 K, what is the new volume of the gas?
A. 1.0 L
B. 2.0 L
C. 3.0 L
D. 4.0 L
Question 6
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after 10 mL of 0.1 M HCl has been added?
A. 1
B. 2
C. 3
D. 4
Question 7
In a typical industrial process, a mixture of 2.5 g of NaOH and 2.5 g of Na2CO3 is heated to produce sodium carbonate and water. Assuming the reaction is complete, calculate the mass of sodium carbonate produced. The molar masses of NaOH and Na2CO3 are 40 g/mol and 106 g/mol, respectively.
A. 1.5 g
B. 2.5 g
C. 3.5 g
D. 4.5 g
Question 8
Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.
A. 1
B. 2
C. 3
D. 4
Question 9
A 0.500 M solution of $\text{H}_2\text{SO}_4$ is mixed with 100. mL of 0.100 M $\text{Ba}\( \text{OH} \)_2$. What is the concentration of the resulting solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 10
A 25 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 10 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 11
A metal (X) reacts with oxygen to form a white solid. The reaction is as follows: 4X + 3O2 → 2X2O3. If 2.50 g of X reacts with 1.00 g of O2, what is the molar mass of X?
A. 50.0 g/mol
B. 75.0 g/mol
C. 100 g/mol
D. 125 g/mol
Question 12
A metal is said to be 'noble' if it does not readily react with other elements. Which of the following metals is an example of a noble metal?
A. Gold (Au)
B. Silver (Ag)
C. Copper (Cu)
D. Zinc (Zn)
Question 13
A diagram of a titration setup is shown below. What is the purpose of the burette in this setup?
A. To measure the volume of the solution
B. To measure the pH of the solution
C. To mix the solution with the titrant
D. To add the titrant to the solution
Question 14
A metal is said to be 'malleable' if it can be pounded into thin sheets. Which of the following metals is an example of a malleable metal?
A. Gold (Au)
B. Silver (Ag)
C. Copper (Cu)
D. Zinc (Zn)
Question 15
A 2.00 M solution of $\text{HCl}$ is mixed with 100. mL of 0.100 M $\text{NaOH}$. What is the concentration of the resulting solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M

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