Post Utme Economics Past Questions and Answers

Question 886:

Calculate the volume of oxygen required to burn completely \(20 \mathrm{~cm}^3\) of Carbon (II) oxide.

A. \(10 \mathrm{~cm}^3\)
B. \(20 \mathrm{~cm}^3\)
C. \(30 \mathrm{~cm}^3\)
D. \(40 \mathrm{~cm}^3\)

Question 887:

One mole of substance contains the ____________

A. Atomic number of particles
B. Faraday's number of particles
C. Avogadro's number of particles
D. Quantum number of particles

Question 888:

\( \mathrm{Zn}+\mathrm{Cu}^{2+} \rightarrow \mathrm{Zn}^{2+}+\mathrm{Cu}\)
From the reaction above, it can be deduced that ____________

A. \(\mathrm{Zn}\) is reduced
B. \(\mathrm{Zn}\) is the oxidizing agent
C. Cu loses electrons oxidizing agent
D. \(\mathrm{Cu}\) is the oxidizing agent

Question 889:

These are factors affecting rate of chemical reaction except ____________

A. Surface area
B. Catalyst
C. Nature of the reactants
D. Activation energy

Question 890:

The unit of rate of chemical reaction is ____________

A. Mol dm-3 \(\mathrm{s}^{-1}\)
B. \(\mathrm{Mol}^{-1} \mathrm{~s}^{-1}\)
C. \(\mathrm{Mol}^{-1}\)
D. S \(\mathrm{mol}^{-1}\)