Post Utme Chemistry Past Questions and Answers

Question 91:

Natural radioactivity is the random spontaneous disintegration of the nucleus of heavy isotope certain elements with the emission of ____________

A. α, β and X-rays
B. α, β and γ -rays
C. A, X and γ -rays
D. β, X and γ -rays

Question 92:

Mg ribbon was allowed to bum inside a giver gas P leaving a white solid residue Q. Addition of water to Q liberated a gas which produces dense white fumes with a drop of hydrochloric acid. The gas P was ____________

A. Nitrogen
B. Chlorine
C. Oxygen
D. Sulphur(IV) oxide

Question 93:

The IUPAC name for the compound

A. 1 -chloro-2-methylprop-2,3-ene
B. 1-chloro-2-methylprop-2-ene
C. 3 -chloro-2-methylprop-1-ene
D. 3-chloro-2-methylprop-1,2-ene

Question 94:

Two immiscible liquids with different boiling points can be separated by ____________

A. The use of separating funnel
B. Evaporation
C. Distillation
D. Decantation

Question 95:

A mixture of \(\mathrm{CaCl}_{2}\) and \(\mathrm{CaCO}_{3}\) in water can be separated by ____________

A. Evaporation
B. Sublimation
C. Distillation
D. Decantation