POST UTME RSU 2021 Chemistry | Objective
Practice these randomly selected questions to test your readiness.
Question 1
The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is present initially, how much will remain after 15 years?
Question 2
The s\tandard Gibbs free energy change for the reaction: 2Ag⁺(aq) + Cr₂O₇²⁻(aq) → 2Ag(s) + Cr³⁺(aq) is -0.47 kJ/mol. Calculate the equilibrium cons\tant (K) for the reaction.
Question 3
Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.
Question 4
A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
Question 5
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mole of C6H12O6(s).
Question 6
A 1.0 M solution of a weak acid HA has a pH of 4.5. Calculate the concentration of the conjugate base A^-.
Question 7
A reaction is first-order with respect to the reac\tant A. If the initial concentration of A is 0.1 M and the rate cons\tant is 0.05 min^-1, calculate the concentration of A after 10 minutes.
Question 8
A diagram of a simple harmonic motion is shown below. If the amplitude of the motion is 5 cm and the time period is 2 s, calculate the angular frequency (ω) of the motion.
Question 9
A diagram of a titration setup is shown below. If 25 cm³ of 0.1 M NaOH is required to neutralize 20 cm³ of 0.05 M HCl, calculate the number of moles of HCl present in the solution.
Question 10
A 0.1 M solution of NaCl is prepared by dissolving 2.5 g of NaCl in 250 cm³ of water. Calculate the number of moles of NaCl that have dissolved.
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