POST UTME OSUSTECH 2017 Chemistry | Objective

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Question 1
A solution of sodium carbonate (Na2CO3) is prepared by dissolving 20.0 g of Na2CO3 in 100 mL of water. What is the molar concentration of the solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 2
A metal (X) reacts with oxygen to form a basic oxide. The oxide is soluble in water and gives a basic solution. What is the identity of the metal?
A. Ca
B. Mg
C. Al
D. Zn
Question 3
A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 100 mL of water. What is the molar concentration of the solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 4
The reaction between chlorine and sodium hydroxide produces sodium chloride and sodium hypochlorite. The reaction is an example of a(n)
A. oxidation-reduction reaction
B. precipitation reaction
C. neutralization reaction
D. displacement reaction
Question 5
The reaction between hydrogen peroxide and potassium iodide produces potassium iodide, hydrogen iodide, and oxygen. The reaction is an example of a(n)
A. oxidation-reduction reaction
B. precipitation reaction
C. neutralization reaction
D. displacement reaction
Question 6
A 0.500 L sample of a 0.100 M solution of NaOH is mixed with a 0.500 L sample of a 0.0500 M solution of HCl. What is the concentration of the resulting solution?
A. 0.0500 M
B. 0.0505 M
C. 0.0510 M
D. 0.0515 M
Question 7
A 2.00 g sample of a metal (X) is heated in a crucible until it melts. The mass of the crucible and the metal is 2.50 g. The mass of the crucible alone is 1.50 g. What is the density of the metal?
A. 8.00 g/cm3
B. 8.00 g/cm3
C. 8.00 g/cm3
D. 8.00 g/cm3
Question 8
Determine the molar mass of a polymer with the following composition: 60% by mass of polyethylene (C2H4)n, 20% by mass of polypropylene (C3H6)n, and 20% by mass of polystyrene (C6H5CHCH3)n. Assume the molar masses of the repeating units are 28 g/mol for polyethylene, 42 g/mol for polypropylene, and 104 g/mol for polystyrene.
A. 240 g/mol
B. 280 g/mol
C. 320 g/mol
D. 360 g/mol
Question 9
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 25.0 mL of NaOH?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 10
A solution of [NaCl] is electrolyzed u\sing a platinum electrode. What is the mass of chlorine gas produced at the anode after 2.00 hours?
A. 0.250 g
B. 0.500 g
C. 1.00 g
D. 2.00 g
Question 11
The reaction between ammonia and nitric acid produces ammonium nitrate. The reaction is an example of a(n)
A. neutralization reaction
B. oxidation-reduction reaction
C. precipitation reaction
D. double displacement reaction
Question 12
A sample of a solid subs\tance has a mass of 25.0 g and a volume of 5.0 cm^3. What is the density of the subs\tance?
A. 5.0 g/cm^3
B. 10.0 g/cm^3
C. 15.0 g/cm^3
D. 20.0 g/cm^3
Question 13
A solution contains 0.250 M NaCl and 0.150 M CaCl2. What is the concentration of Cl- ions in the solution?
A. 0.350 M
B. 0.400 M
C. 0.450 M
D. 0.500 M
Question 14
A diagram of a titration apparatus is shown below. Identify the part labeled 'A'.
A. A burette
B. A beaker
C. A pipette
D. A flask
Question 15
A 2.00 g sample of a subs\tance is dissolved in 25.0 mL of water. What is the molarity of the solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M

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