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POST UTME OSUSTECH 2017 Chemistry | Objective

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Question 1 View Details

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

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Question 2 View Details

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

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Question 3 View Details

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

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Question 4 View Details

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

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Question 5 View Details

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

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Question 6 View Details

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

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Question 7 View Details

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

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Question 8 View Details

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

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Question 9 View Details

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

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Question 10 View Details

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

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Question 11 View Details

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

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Question 12 View Details

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

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Question 13 View Details

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

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Question 14 View Details

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

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Question 15 View Details

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

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Question 16 View Details

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

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Question 17 View Details

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

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Question 18 View Details

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

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Question 19 View Details

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

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Question 20 View Details

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

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Question 21 View Details

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

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Question 22 View Details

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

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Question 23 View Details

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

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Question 24 View Details

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

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Question 25 View Details

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

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