Post Utme Chemistry Past Questions and Answers

Question 981:

The reaction, \(A+B \rightarrow C\), can be represented by the equation, \(r=k[A][B]\), \(k\) in this equation is, ____________

A. Proportionality constant
B. Rate constant
C. Equilibrium constant
D. Boltzmann constant

Question 982:

The reaction that takes places in Daniel cell is, ____________

A. Zn/ \(Zn ^{2}+/ / Cu ^{2} \cdot / Cu\)
B. \(Zn / Zn ^{2+} / / Cu / Cu ^{2+}\)
C. \(Zn ^{2+} / Zn / / Cu ^{2+} / Cu\)
D. \(Zn ^{2+} / Zn / / Cu / Cu ^{2+}\)

Question 983:

\(100.0 g\) of \(KClO _{3}\) was added to \(40.0 cm ^{3}\) of water to give a saturated solution at \(298 K\). If the solubility of the salt is \(20.0 moldm ^{-3}\) at \(298 K\), what percentage of the salt is left undisolved?
\([ K =39, Cl =35.5, O =16]

A. \(80 \%\)
B. \(60 \%\)
C. \(5 \%\)
D. \(2 \%\)

Question 984:

A tertiary amine is ____________

A. Ethylamine
B. Diethylamine
C. Triethylamine
D. Tetraethylamine

Question 985:

An electron described by the quantum number, \(n=4, l=\) 3 can be located in what orbital?

A. \(4 f\)
B. \(3 s\)
C. \(3 d\)
D. \(4 p\)