Post Utme Chemistry Past Questions and Answers

Question 861:

What is the mole fraction of water in a solution prepared by mixing \(12.5 g\) of \(H _{2} O\) with \(220 g\) of acetone?

A. \(0.817\)
B. \(0.845\)
C. \(0.183\)
D. \(0.155\)
E. \(0.205\)

Question 862:

A consequence of global warming is ____________

A. Air pollution
B. Wafer pollution
C. Increased humidity
D. Flooding
E. Little sunshine

Question 863:

Gunpowder is made from charcoal, Sulphur and Potassium trioxonitrate(V).
The salt in the mixture perform \({ }^{\wedge}\) function of ____________

A. An oxidant
B. A reductant
C. A solvent
D. A catalyst
E. Exploder

Question 864:

Which one of the following group II elements has the highest first ionization energy?

A. Be
B. Mg
C. Ca
D. Sr
E. B

Question 865:

In which one of the following compounds does sulphur have an oxisation number of \(+4\) ?

A. \(H _{2} 3 O _{4}\)
B. \(H _{2}\)
C. \(SO _{2} \quad\)
D. \(Na _{2} SO _{3}\)
E. \(H _{2} S _{2} O _{7}\)