Post Utme Chemistry Past Questions and Answers

Question 271:

The relative atomic mass of a naturally occurring lithium consisting of \(90 \% \mathrm{Li}\) and \(10 \% \mathrm{Li}\) is ____________

A. 6.9
B. \(7.1\)
C. \(6.2\)
D. \(6.8\)

Question 272:

Which of the allotropes of carbon is a constituent of a lead pencil?

A. Graphite
B. Diamond
C. Lampblack
D. Soot

Question 273:

Coffee stains can best be removed by ____________

A. Turpentine
B. Kerosene
C. A solution of borax in water
D. Ammonia solution

Question 274:

Iron can be prevented from corrosion by coating the surface with ____________

A. Gold
B. Silver
C. Zinc
D. Copper

Question 275:

Substances used as drying agents are usually ____________

A. Amphoteric
B. Acidic
C. Hygroscopic
D. Efflorescent