POST UTME CALEB UNIVERSITY 2018 Chemistry | Objective

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Question 1
Determine the molar mass of a polymer with the following monomer units: CH2=CH-CH2-CH2-CH3. Assume that the polymer is composed of 50% of the monomer units with the formula CH2=CH-CH2-CH2-CH3 and 50% of the monomer units with the formula CH2=CH-CH2-CH2-CH2.
A. 150 g/mol
B. 180 g/mol
C. 200 g/mol
D. 220 g/mol
Question 2
A diagram of a spectrophotometer setup is shown below. The diagram shows a light source, a sample, and a detector. The sample is a solution of 0.1 M CuSO4. What is the wavelength of the light that is absorbed by the sample?
A. 400 nm
B. 450 nm
C. 500 nm
D. 550 nm
Question 3
A diagram of a titration setup is shown below. The diagram shows a burette containing 0.1 M HCl and a flask containing 25 mL of 0.1 M NaOH. The burette is filled with 10 mL of HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 4
A diagram of a chromatography setup is shown below. The diagram shows a column containing a stationary phase and a mobile phase. The mobile phase is a solution of 0.1 M NaCl. What is the Rf value of a compound with the formula C6H5CH2CH2OH?
A. 0.5
B. 0.6
C. 0.7
D. 0.8
Question 5
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10

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