Post Utme Chemistry Past Questions and Answers

Question 1106:

Which of the following is NOT the correct product formed when the parent metal is heated in air?

A. Calcium Oxide \(( CaO )\)
B. Sodium Oxide \(\left( Na _{2} O \right)\)
C. Copper (II) oxide \(( CuO )\)
D. Tri - iron tetroxide \(\left( Fe _{3} O _{4}\right)\)
E. Aluminium Oxide \(\left( Al _{2} O _{3}\right)\)

Question 1107:

Which of the following roles does sodium chloride play in soap preparation? It ____________

A. Reacts with glycerol
B. Purifies the soap
C. Accelerates the decomposition of the fat and oil
D. Separates the soap from the glyccrol
E. Coverts the fat acid to its sodium salt

Question 1108:

The flame used by welders in cutting metals is ____________

A. Butane gas flame
B. Acetylene - hydroflane
C. Kerosene flame
D. Oxyacetylene
E. Oxygen flame

Question 1109:

The function of sulphur during the vulcanization of rubber is to ____________

A. Act as catalyst for the polymerization of rubber molecules
B. Covert rubber from thermosetting thermo plastic polymer
C. Form chains which bind rubber molecular together
D. Break down rubber polymer molecule
E. Shorter the chain length of rubber polymer

Question 1110:

Which of the following compounds is \(NOT\) formed by the action of chlorine on methane?

A. \(CH _{3} Cl\)
B. \(C _{2} H _{5} Cl \)
C. \(CH _{2} Cl _{2}\)
D. \(CHCl _{3}\)
E. \(CH _{4} Cl\)