POST UTME OSUSTECH 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a metal atom is shown below. Identify the type of bond that holds the electrons in the outermost energy level.
A. Ionic bond
B. Covalent bond
C. Metallic bond
D. Hydrogen bond
Question 2
A 1.00-L sample of a gas at 298 K has a pressure of 1.00 atm. What is the volume of the gas at 373 K and 2.00 atm?
A. 0.50 L
B. 1.00 L
C. 1.50 L
D. 2.00 L
Question 3
The reaction between sodium hydroxide and acetic acid produces sodium acetate and water. The reaction is an example of a(n)
A. neutralization reaction
B. oxidation-reduction reaction
C. precipitation reaction
D. double displacement reaction
Question 4
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 5
A metal oxide has the formula M2O3. If 2.5 g of the oxide is heated in a stream of hydrogen gas, what is the mass of the metal (M) obtained?
A. 2.5 g
B. 3.75 g
C. 5.0 g
D. 6.25 g
Question 6
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 7
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 8
Determine the major product of the reaction between 2-methylpropene and HBr.
A. 1-bromo-2-methylpropane
B. 2-bromo-2-methylpropane
C. 1-bromo-2-methylbu\tane
D. 2-bromo-2-methylbu\tane
Question 9
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 10
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 11
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 12
A 25.0 mL sample of 0.100 M NaOH is mixed with 25.0 mL of 0.100 M HCl. What is the pH of the resulting solution?
A. 1
B. 7
C. 10
D. 14
Question 13
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?
A. 0.0500 M
B. 0.100 M
C. 0.500 M
D. 1.00 M
Question 14
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
Question 15
A 0.10 M solution of $\text{NaOH}$ is mixed with a 0.20 M solution of $\text{HCl}$. What is the concentration of $\text{OH}^-$ ions in the resulting solution?
A. 0.05 M
B. 0.10 M
C. 0.15 M
D. 0.20 M

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