Post Utme General Paper Past Questions and Answers

Question 871:

Which of the following compounds will NOT produce fumes when treated with hydrogen chloride in the presence of zinc chloride catalysts?
I. \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH} \)
II. \(\mathrm{CH}_3 \mathrm{CHO}\)
III. \(\mathrm{CH}_3 \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_3\)
IV. (IV) \(\mathrm{CH}_3 \mathrm{COCH}_3\)
V. (V) \(\mathrm{CH}_3 \mathrm{COOH}\)

A. II, IV, V
B. I, II, III
C. II, III, IV
D. I, II, IV

Question 872:

\(3220 \mathrm{~cm}^3\) of a gaseous hydrocarbon and \(150 \mathrm{~cm}^3\) of oxygen were exploded in a closed vessel at room temperature. After cooling, \(110 \mathrm{~cm}^3\) of gases remaineD. After absorption by concentrated sodium hydroxide solution, the volume left was \(50 \mathrm{~cm}^3\). The molecular formula of the hydrocarbon is?

A. \(\mathrm{C}_3 \mathrm{H}_6\)
B. \(\mathrm{C}_3 \mathrm{H}_8\)
C. \(\mathrm{C}_4 \mathrm{H}_{10}\)
D. \(\mathrm{C}_4 \mathrm{H}_8\)

Question 873:

Simplify \(\cot ^2 x-\operatorname{cosec}^2 x\)

A. 1
B. \(\cos 2 x\)
C. \(-1\)
D. \(2 \sin x\)

Question 874:

In a triangle \(\mathrm{ABC}, \mathrm{a}=5 \mathrm{~cm}, \mathrm{~b}=7 \mathrm{~cm}\) and angle \(\mathrm{C}=60^{\circ}\). Find \(\mathrm{c}\)

A. \(2 \mathrm{~cm}\)
B. \(\sqrt{119 \mathrm{~cm}}\)
C. \(\sqrt{39 \mathrm{~cm}}\)
D. \(6 \mathrm{~cm}\)

Question 875:

Calculate the sum of interior angles of a 13 sided polygon ____________

A. \(1980^{\circ}\)
B. \(2340^{\circ}\)
C. \(1620^0\)
D. \(130^{\circ}\)