POST UTME RSU 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a titration setup is shown below. If the burette contains 0.1 M HCl and the titration is carried out at 25°C, calculate the number of moles of NaOH required to reach the equivalence point.
A. 0.01 mol
B. 0.05 mol
C. 0.1 mol
D. 0.5 mol
Question 2
A 0.1 M solution of a weak acid HA is mixed with 0.1 M solution of a weak base B. If the resulting solution has a pH of 4.5, calculate the value of the dissociation cons\tant of the acid (Ka) if the dissociation cons\tant of the base (Kb) is 1.0 x 10^-5.
A. 1.0 x 10^-4
B. 1.0 x 10^-3
C. 1.0 x 10^-2
D. 1.0 x 10^-1
Question 3
A 2.0 L sample of a gas at 25°C and 1 atm is collected over water at 25°C. If the partial pressure of the gas is 0.8 atm, calculate the mole \fraction of the gas in the sample.
A. 0.4
B. 0.5
C. 0.6
D. 0.7
Question 4
A 0.1 M solution of a weak acid HA is mixed with 0.1 M solution of a weak base B. If the resulting solution has a pH of 4.5, calculate the value of the dissociation cons\tant of the acid (Ka) if the dissociation cons\tant of the base (Kb) is 1.0 x 10^-5.
A. 1.0 x 10^-4
B. 1.0 x 10^-3
C. 1.0 x 10^-2
D. 1.0 x 10^-1
Question 5
A diagram of a simple harmonic motion setup is shown below. If the amplitude of the motion is 2.0 cm and the frequency is 5.0 Hz, calculate the angular frequency (ω) of the motion.
A. 10 rad/s
B. 20 rad/s
C. 30 rad/s
D. 40 rad/s

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