Exam Body

Year

Subject

Paper Type

POST UTME OSUSTECH 2017 Chemistry | Objective

Are you preparing for POST UTME OSUSTECH exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2017 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

A sample of an ideal gas is heated at cons\tant volume. Which of the following statements is TRUE?

A. The pressure of the gas increases.

B. The pressure of the gas decreases.

Correct C. The pressure of the gas remains cons\tant.

D. The pressure of the gas becomes zero.

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 2

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

Correct B. 3.75 g

C. 5.0 g

D. 6.25 g

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 3

A solution of sodium hydroxide (NaOH) is titrated with hydrochloric acid (HCl). The reaction is as follows: NaOH + HCl → NaCl + H2O. If 25.0 mL of 0.100 M NaOH is titrated with 0.100 M HCl, what is the volume of HCl required to reach the equivalence point?

A. 12.5 mL

Correct B. 25.0 mL

C. 37.5 mL

D. 50.0 mL

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 4

A diagram of a titration apparatus is shown below. Identify the part labeled 'A'.

Correct A. A burette

B. A beaker

C. A pipette

D. A flask

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 5

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

Correct B. Covalent bond

C. Metallic bond

D. Hydrogen bond

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 6

Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol.

Correct A. -1206.60 kJ/mol

B. -1206.60 kJ/mol

C. -1206.60 kJ/mol

D. -1206.60 kJ/mol

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 7

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

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 8

The s\tandard reduction potential of the Mn2+/Mn couple is -1.18 V. What is the s\tandard reduction potential of the MnO4-/Mn couple?

Correct A. +1.23 V

B. +1.23 V

C. +1.23 V

D. +1.23 V

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 9

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?

Correct A. Ca

B. Mg

C. Al

D. Zn

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

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?

Correct A. 8.00 g/cm3

B. 8.00 g/cm3

C. 8.00 g/cm3

D. 8.00 g/cm3

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 11

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

Correct C. 320 g/mol

D. 360 g/mol

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 12

A 2.5 L sample of a gas at 27°C and 1.5 atm is collected over water. If the vapor pressure of water at 27°C is 0.031 atm, what is the partial pressure of the gas?

A. 1.469 atm

B. 1.4695 atm

Correct C. 1.470 atm

D. 1.471 atm

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

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

Correct B. 0.400 M

C. 0.450 M

D. 0.500 M

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 14

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

Correct C. 0.0510 M

D. 0.0515 M

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

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

Correct B. 0.200 M

C. 0.300 M

D. 0.400 M

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 16

Determine the major product of the reaction between 2-methylpropene and HBr.

Correct A. 1-bromo-2-methylpropane

B. 2-bromo-2-methylpropane

C. 1-bromo-2-methylbu\tane

D. 2-bromo-2-methylbu\tane

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 17

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

Correct B. 7

C. 10

D. 14

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 18

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

Correct B. 0.100 M

C. 0.500 M

D. 1.00 M

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 19

The diagram below shows a simple circuit with a battery, a resistor, and a switch. If the switch is closed, what is the direction of the current flow?

Correct A. From the battery to the resistor

B. From the resistor to the battery

C. In a circular path around the circuit

D. There is no current flow

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 20

A diagram of a plant cell is shown below. Identify the part labeled A.

Correct A. Nucleus

B. Mitochondria

C. Chloroplast

D. Vacuole

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 21

At 298 K, the equilibrium cons\tant for the reaction $\text{N}_2\text{O}_4(g) \rightleftharpoons 2\text{NO}_2(g)$ is $K_c = 1.8 \times 10^{-3}$. If the initial concentrations of $\text{N}_2\text{O}_4$ and $\text{NO}_2$ are $0.10$ M and $0.00$ M, respectively, what is the equilibrium concentration of $\text{NO}_2$?

Correct A. 0.05 M

B. 0.10 M

C. 0.15 M

D. 0.20 M

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 22

A 2.50-g sample of a compound containing only carbon and hydrogen is analyzed by combustion and found to produce 2.00 g of CO2 and 0.50 g of H2O. What is the empirical formula of the compound?

Correct A. CH2

B. C2H4

C. C3H6

D. C4H8

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 23

A solution contains 0.10 M $\text{Fe}^{3+}$ ions. What is the concentration of $\text{Fe}^{2+}$ ions if 0.50 M $\text{Fe}^{2+}$ ions are added to the solution?

A. 0.05 M

Correct B. 0.10 M

C. 0.20 M

D. 0.30 M

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 24

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

Correct C. 1.50 L

D. 2.00 L

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 25

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

Correct B. 0.10 M

C. 0.15 M

D. 0.20 M

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows

Help others prepare! Share this practice hub:

Chat with Support