POST UTME COAL CITY UNIVERSITY 2018 Chemistry | Objective

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Question 1
A solution containing 0.05 M H2SO4 is titrated with 0.05 M NaOH. What is the pH of the solution after the addition of 20 mL of NaOH?
A. 1
B. 2
C. 3
D. 4
Question 2
A 2.0 M solution of HCl is mixed with a 2.0 M solution of NaOH. If 100 mL of each solution is used, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 3
The reaction between sodium hydroxide and hydrochloric acid is represented by the equation: \[ \text{NaOH} + \text{HCl} \rightarrow \text{NaCl} + \text{H}_2\text{O} \]. Calculate the number of moles of sodium hydroxide required to react with 2.5 moles of hydrochloric acid.
A. 2.5 mol
B. 1.0 mol
C. 0.5 mol
D. 1.5 mol
Question 4
A solution containing 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 10 mL of NaOH?
A. 1
B. 2
C. 3
D. 4
Question 5
A 25 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 15 mL of NaOH?
A. 1
B. 2
C. 3
D. 4
Question 6
A 2.5 g sample of sulfur is burned in oxygen to produce sulfur dioxide gas. Calculate the volume of sulfur dioxide gas produced at STP.
A. 1.0 L
B. 2.0 L
C. 3.0 L
D. 4.0 L
Question 7
A 20 mL sample of a solution containing 0.05 M H2SO4 is titrated with 0.05 M NaOH. What is the pH of the solution after the addition of 15 mL of NaOH?
A. 1
B. 2
C. 3
D. 4
Question 8
The reaction of chlorine with sodium produces sodium chloride. The equation for this reaction is: \( 2Na + Cl_2 \rightarrow 2NaCl \). What is the oxidation state of chlorine in sodium chloride (NaCl)?
A. -1
B. +1
C. +3
D. -3
Question 9
A solution contains 0.1 M HCl and 0.3 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 10
A solution contains 0.1 M HCl and 0.2 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 11
A 25 mL sample of 0.5 M NaOH is added to 50 mL of 0.1 M HCl. What is the concentration of the resulting solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 12
Determine the number of moles of electrons transferred during the electrolysis of 2.5 L of water at 25°C and 1 atm, given that the cell potential is 1.23 V.
A. 0.5 mol
B. 1.0 mol
C. 1.5 mol
D. 2.0 mol
Question 13
A polymer has a molecular weight of 30,000 g/mol and a degree of polymerization of 300. What is the molar mass of the repeating unit?
A. 100 g/mol
B. 200 g/mol
C. 50 g/mol
D. 25 g/mol
Question 14
The reaction of sulfur with oxygen produces sulfur dioxide. The equation for this reaction is: \( S + O_2 \rightarrow SO_2 \). What is the oxidation state of sulfur in sulfur dioxide \( SO_2 \)?
A. +4
B. +2
C. +6
D. -2
Question 15
A sample of sulfur dioxide gas is collected over water at 25°C and 1 atm. Calculate the partial pressure of sulfur dioxide gas, given that the total pressure is 1.5 atm.
A. 0.5 atm
B. 0.6 atm
C. 0.7 atm
D. 0.8 atm

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