Post Utme University of Port Harcourt Chemistry Past Questions and Answers

Question 1:

Stainless steel is an alloy of ____________

A. Carbon, iron and lead
B. Carbon, iron and chromium
C. Carbon, iron and copper
D. Carbon, iron and silver
E. Carbon and iron only

Question 2:

Crude petroleum usually seen on some Nigeria's creeks and waterways can be dispersed or removed by ____________

A. Heating the affected parts in order to boil off the petroleum
B. Mechanically stirring to dissolve the petroleum in water
C. Pouring organic solvents to dissolve the petroleum
D. Spraying the water with detergents
E. Cooling to freeze out the petroleum

Question 3:

Solution \(X, Y\) and \(Z\) have pH values of \(3.0,5.0\) and \(9.0\) respectively. Which of the \\ following statements are correct?

A. All the solutions are acidic
B. All solutions are basic
C. \(Y\) and \(Z\) are more acidic than eater
D. \(Y\) is more acidic than \(X\)
E. \(Z\) is the least acidic

Question 4:

A molar solution of caustic soda is prepared by dissolving ____________

A. \(40 \mathrm{~g} \mathrm{NaOH}\) in \(100 \mathrm{~g}\) of water
B. \(40 \mathrm{~g} \mathrm{NaOH}\) in \(1000 \mathrm{~g}\) of water
C. \(20 \mathrm{~g} \mathrm{NaOH}\) in \(500 \mathrm{~g}\) of solution
D. \(20 \mathrm{~g} \mathrm{NaOH}\) in \(1000 \mathrm{~g}\) of solution
E. \(20 \mathrm{~g} \mathrm{NaOH}\) in \(80 \mathrm{~g}\) of solution

Question 5:

Water is said to be hard if it ____________

A. Easily forms ice
B. Has to be warmed before sodium chloride dissolves in it
C. Forms an insoluble scum with soap
D. Contains nitrates
E. Contains sodium ions