Post Utme Chemistry Past Questions and Answers

Question 6:

When \(\mathrm{KOH}\) is used instead of \(\mathrm{NaOH}\) in the production of soap, it has the following advantages except it gives ____________

A. Softer soap
B. Harder soap
C. Soap with lower melting point
D. More soluble soap

Question 7:

When palm wine is left exposed to air for a few days, it goes sour. The bacteria in the air oxidises ____________ in palm wine to ____________

A. Ethanol, ethanoic acid
B. Ethanoic acid, ethanol
C. Ester, ethanoic acid
D. Ether, ethanol

Question 8:

Which of the following is not true about benzoic acid?

A. It is aromatic in nature
B. It can be manufactured from methylbenzene
C. It has molecular formula \(\mathrm{C}_{6} \mathrm{H}_{6} \mathrm{COOH}\)
D. It sublimes readily

Question 9:

Which of the following reactions is correct?

A. \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COOH}+\mathrm{CaO} \rightarrow \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{Ca}+\mathrm{HCO}_{3}\)
B. \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COOH}+\mathrm{CaO} \rightarrow \mathrm{C}_{6} \mathrm{H}_{6}+\mathrm{CaCO}_{3}\)
C. \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COOH}+\mathrm{PCl}_{5} \rightarrow \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{Cl}+\mathrm{H}_{2} \mathrm{PO}_{4}\)
D. \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COOH}+\) \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH} \rightarrow \mathrm{C}_{6} \mathrm{H}_{6}+\mathrm{C}_{3} \mathrm{H}_{8} \mathrm{COOH}\)

Question 10:

Which of these is not a property of ethanedioic acid?

A. It is a stronger acid than ethanoic acid but weaker than inorganic acids
B. It is a reducing agent
C. It is an oxidising agent
D. It is soluble in cold water