Post Utme Ladoke Akintola University of Technology Chemistry Past Questions and Answers

Question 11:

The farmula bafte compound formed in a reaction between a trivalent metal, \(M\) and a tetravalent non-metal \(X\) is _____________

A. \(M X\)
B. \(M_{3} X_{4}\)
C. \(M_{4} X_{3}\)
D. \(M_{3} X_{2}\)

Question 12:

One mole of propane is mixed with five moles of oxygen. The mixture is ignited and the propane burns completely. Whay is the volume of the products at s.t.p.?
[G. M. V. \(=22.4 dm 3 mol\) ']

A. \(112.0 dm ^{3}\)
B. \(67.2 dm ^{3}\)
C. \(56.0 dm ^{3}\)
D. \(4.8 dm ^{3}\)

Question 13:

How many unpaired electrons are there in the electronic configuration of an element with atomic number 8 ?

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

Question 14:

The secondary valence is called _____________

A. Oxidation state
B. Lewis base
C. Coordination number
D. Chelates

Question 15:

Which of these is not a hydroscopic salt?

A. Calcium oxide
B. Magnesium chloride
C. Copper (II) oxide
D. Sodium trioxonitrate(V)