Post Utme Federal University of Technology, Owerri Chemistry Past Questions and Answers

Question 1:

When air which contains the gases: oxygen, nitrogen, carbon dioxide, water vapour and the rare gases, is passed through alkaline pyrogallot and then over quicklime, the only gases left are:

A. Nitrogen and carbondioxide
B. The rare gases
C. Nitrogen and oxygen
D. Nitrogen and the rare gases
E. Nitrogen, carbondioxide and the rare gases.

Question 2:

When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as ____________

A. Disintegration
B. Polymerization
C. Cracking
D. Degradation
E. Distillation

Question 3:

When each of the nitrates of potassium, magnesium and iron is heated ____________

A. All the nitrates decompose to their oxides
B. The nitrate of magnesium gives the nitrite and oxygen
C. The nitrates of magnesium and iron give the oxides
D. The nitrate of iron gives the nitrite and oxygen
E. The nitrate of the magnesium is not decomposed

Question 4:

Helium atoms are chemically unreactive because ____________

A. There are no electrons around the nucleus
B. The number of protons equals the number of electrons
C. There are equal number bf protons and neutrons in the nucleus
D. The outer electron shell is completely filled
E. The atoms contain only protons

Question 5:

How many grams of \(HBr\) would exactly be required to react with \(2 g\) of propyne? \(( C =12, H =1, Br =80)

A. 4.1 g\)
B. \(6.1 g\)
C. \(8.1 g\)
D. \(10 . lg\)
E. \(16.2 g\)