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POST UTME MADONNA UNIVERSITY 2019 Chemistry | Objective

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Question 1

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 15.0 mL of NaOH.

A. ( 3.00 )

Correct B. ( 4.00 )

C. ( 5.00 )

D. ( 6.00 )

Correct Answer: B

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Question 2

The diagram below shows a titration setup. Identify the part labeled A.

Correct A. A burette

B. A beaker

C. A test tube

D. A cell

Correct Answer: A

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Question 3

A sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of HCl added when the pH of the solution is 3.00.

A. ( 0.00500 ) mol

B. ( 0.0100 ) mol

Correct C. ( 0.0150 ) mol

D. ( 0.0200 ) mol

Correct Answer: C

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Question 4

The diagram below shows a titration setup. Identify the part labeled B.

A. A burette

Correct B. A beaker

C. A test tube

D. A cell

Correct Answer: B

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Question 5

A sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the volume of NaOH added when the number of moles of HCl added is 0.0150 mol.

A. ( 15.0 ) mL

B. ( 20.0 ) mL

Correct C. ( 25.0 ) mL

D. ( 30.0 ) mL

Correct Answer: C

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Question 6

The reaction between zinc metal and copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). If 25.0 g of zinc metal is added to 250 mL of 0.100 M copper(II) sulfate solution, what is the limiting reac\tant?

Correct A. Zinc metal

B. Copper(II) sulfate solution

C. Neither zinc metal nor copper(II) sulfate solution is the limiting reac\tant

D. Both zinc metal and copper(II) sulfate solution are the limiting reac\tants

Correct Answer: A

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Question 7

A 2.50 L sample of a gas at 25°C and 1.00 atm is collected over water. If the vapor pressure of water at 25°C is 23.8 torr, what is the partial pressure of the gas?

A. 1.00 atm

Correct B. 0.976 atm

C. 1.024 atm

D. 1.048 atm

Correct Answer: B

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Question 8

A solution contains 0.100 M NaCl and 0.100 M KNO3. What is the concentration of Cl- ions in the solution?

A. 0.100 M

Correct B. 0.0500 M

C. 0.0750 M

D. 0.0250 M

Correct Answer: B

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Question 9

The diagram below shows a titration setup. If 25.0 mL of 0.100 M HCl is added to 25.0 mL of 0.100 M NaOH, what is the pH of the resulting solution?

A. 7.00

Correct B. 8.00

C. 9.00

D. 10.0

Correct Answer: B

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Question 10

A 2.50 g sample of a metal is heated in a crucible until it reaches a temperature of 1000°C. If the metal has a specific heat capacity of 0.100 J/g°C, what is the energy absorbed by the metal?

A. 250 J

B. 500 J

C. 750 J

Correct D. 1000 J

Correct Answer: D

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Question 11

In a titration experiment, 25.0 mL of 0.100 M NaOH is added to 20.0 mL of 0.0500 M HCl. If the reaction is complete, what is the concentration of the excess NaOH in the resulting solution?

A. 0.0500 M

Correct B. 0.100 M

C. 0.150 M

D. 0.200 M

Correct Answer: B

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Question 12

A sample of water contains 1.0 ppm of dissolved oxygen. If 100.0 mL of this water is collected and analyzed, what is the mass of dissolved oxygen in the sample?

Correct A. 0.001 g

B. 0.010 g

C. 0.100 g

D. 1.000 g

Correct Answer: A

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Question 13

A 5.0 g sample of a polymer is dissolved in 100.0 mL of solvent. If the solution has a density of 1.0 g/mL, what is the concentration of the polymer in g/L?

A. 0.050 g/L

B. 0.100 g/L

Correct C. 0.500 g/L

D. 1.000 g/L

Correct Answer: C

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Question 14

A 2.0 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in water and diluting to a total volume of 1.0 L. What is the molarity of the resulting solution?

A. 1.0 M

Correct B. 2.0 M

C. 4.0 M

D. 8.0 M

Correct Answer: B

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Question 15

A 0.100 M solution of HCl is prepared by dissolving 3.0 g of HCl in water and diluting to a total volume of 1.0 L. What is the molarity of the resulting solution?

A. 0.050 M

Correct B. 0.100 M

C. 0.200 M

D. 0.500 M

Correct Answer: B

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Question 16

Determine the molar solubility of CaF2 in a 0.1 M NaF solution, given that the solubility product cons\tant (Ksp) for CaF2 is 3.9 × 10^-11.

A. 1.0 × 10^-3 M

Correct B. 1.0 × 10^-4 M

C. 1.0 × 10^-5 M

D. 1.0 × 10^-6 M

Correct Answer: B

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Question 17

A 2.5 L flask contains 0.50 M CH3OH. Calculate the number of moles of CH3OH present in the flask.

A. 0.50 mol

Correct B. 1.25 mol

C. 2.50 mol

D. 5.00 mol

Correct Answer: B

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Question 18

A 25.0 mL sample of a 0.10 M solution of NaOH is titrated with 0.10 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.

A. 0.0025 mol

Correct B. 0.0050 mol

C. 0.0075 mol

D. 0.0100 mol

Correct Answer: B

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Question 19

A 1.0 L flask contains 0.50 M SO2. Calculate the partial pressure of SO2 in the flask at 25°C.

A. 0.50 atm

Correct B. 1.0 atm

C. 2.0 atm

D. 3.0 atm

Correct Answer: B

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Question 20

A 2.0 L flask contains 0.50 M H2S. Calculate the number of moles of H2S present in the flask.

A. 0.50 mol

Correct B. 1.0 mol

C. 2.0 mol

D. 3.0 mol

Correct Answer: B

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Question 21

A sample of gas occupies a volume of 2.5 L at a temperature of 298 K and a pressure of 1.2 atm. If the temperature is increased to 323 K while keeping the pressure cons\tant, what is the new volume of the gas?

Correct A. 3.2 L

B. 2.5 L

C. 1.9 L

D. 4.1 L

Correct Answer: A

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Question 22

A solution contains 25 g of NaCl in 100 mL of water. What is the molarity of the solution?

A. 0.5 M

Correct B. 1.0 M

C. 2.0 M

D. 3.0 M

Correct Answer: B

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Question 23

A metal rod has a length of 2.5 m and a cross-sectional area of 0.05 m^2. If a force of 500 N is applied to the rod, what is the stress on the rod?

Correct A. 1000 Pa

B. 500 Pa

C. 2000 Pa

D. 2500 Pa

Correct Answer: A

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Question 24

A sample of water contains 10^20 molecules. If the sample is heated from 20°C to 80°C, what is the change in the average kinetic energy of the molecules?

A. 1.5 kJ/mol

Correct B. 2.5 kJ/mol

C. 3.5 kJ/mol

D. 4.5 kJ/mol

Correct Answer: B

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Question 25

A solution contains 10 g of glu\cose in 100 mL of water. What is the concentration of the solution in g/mL?

A. 0.1 g/mL

Correct B. 0.2 g/mL

C. 0.3 g/mL

D. 0.4 g/mL

Correct Answer: B

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