Post Utme Chemistry Past Questions and Answers

Question 201:

Elements \(X, Y\) and \(Z\) belong to groups I, V and VI respectively. Which of the following is TRUE about the bond types of \(X Z\) and YZ3?

A. Both are electrovalent
B. Both are covalent
C. \(X Z\) is electrovalent and \(Y Z\) is covalent
D. \(X Z\) is covalent and \(Y Z 3\) is electrovalent

Question 202:

Which of the following is a double salt?

A. \(\mathrm{K}_{3} \mathrm{Fe}(\mathrm{CN})_{6}\)
B. \(\operatorname{KAl}\left(\mathrm{SO}_{4}
ight)_{2} \cdot 12 \mathrm{H}_{2} \mathrm{O}\)
C. \(\mathrm{Pb}(\mathrm{OH})_{2} .2 \mathrm{PbCO}_{3}\)
D. \(\mathrm{KHSO}_{4}\)

Question 203:

Find the value all in the equation \(\mathrm{XO}_{3}^{\mathrm{n-}}+4 \mathrm{H}^{+}+3^{\mathrm{e}-} \rightarrow \mathrm{XO}+2 \mathrm{H}^{2} \mathrm{O}\)

A. 1
B. 2
C. 3
D. 5

Question 204:

Corrosion in metals is an example of ____________

A. Electrochemical process
B. Half-cell reaction
C. Metal-plating device
D. Metal coupling device

Question 205:

An example of a suspension of solid particles in a gas is ____________

A. Harmattan
B. Aerosol spray
C. Fogs
D. Emulsion