Post Utme Chemistry Past Questions and Answers

Question 666:

The alkanol obtalned from the production of soap is ____________

A. Ethanol
B. Glycerol
C. Methanol
D. Propanol
E. Glycol

Question 667:

The flame used by welders in cotton metals is ____________

A. Butane gas flame
B. Glycerol
C. Kerosene flame
D. Oxy-acetylene flame
E. Oxygen flame

Question 668:

Consecutive members of an alkane homologues series differ by ____________

A. \(\mathrm{CH}\)
B. \(\mathrm{CH}_{2}\)
C. \(\mathrm{CH}_{3}\)
D. \(\mathrm{C}_{\mathrm{cH}}\)
E. \(\mathrm{CnH}_{2 \mathrm{n}-2}\)

Question 669:

If an element has the electronic configuration \(1 S^{2}, 2 S^{2}, 2 S^{2} 2 p^{6} 3 S^{6}\), it is ____________

A. Metal
B. An alkaline
C. An s-block element
D. A-block element
E. A transition element

Question 670:

Some copper (II) sulphate pentahydrate \(\left(\mathrm{USO}_{4} \mathrm{SH}_{2} \mathrm{O} \right)\), was heated at \(120^{\circ} \mathrm{C}\) with the following results: wt of crucible \(=10.00 \mathrm{~g}\); wt of crucible + \(\mathrm{CUSO}_{4} \mathrm{SH}_{2} \mathrm{O}=14.98 \mathrm{~g}\) wt of crucible \(+\) residue \(=13.54 \mathrm{~g}\). how many molecules of water of crystallization were lost?

\((\mathrm{H}=1, \mathrm{Cu}=63.5, \mathrm{O}=16.332)\)

A. 1
B. 2
C. 3
D. 4
E. 5