Post Utme Chemistry Past Questions and Answers

Question 461:

On heating, which of the following compound will decompose to the free metal, nitrogen (IV) oxide and oxygen?

A. \(\mathrm{AgNO}_{3}\)
B. \(\mathrm{Cu}\left(\mathrm{NO}_{3} \right)_{2}\)
C. \(\mathrm{NaNO}_{3}\)
D. \(\mathrm{Ca}\left(\mathrm{NO}_{3} \right)_{2}\)

Question 462:

The general formula of haloalkanes where \(X\) represents the halide is ____________

A. \(\mathrm{C}_{\mathrm{n}} \mathrm{H}_{2 \mathrm{n}} \mathrm{X}\)
B. \(\mathrm{C}_{\mathrm{n}} \mathrm{H}_{2 \mathrm{n}+2} \mathrm{X}\)
C. \(\mathrm{C}_{n} \mathrm{H}_{2 n-1} \mathrm{X}\)
D. \(\mathrm{C}_{n} \mathrm{H}_{2 n+1} \mathrm{X}\)

Question 463:

An organic compound has an empirical formula \(\mathrm{CH}_{2} \mathrm{O}\) and vapour density of 45 . What is its molecular formula?

A. \(\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}_{2}\)
B. \(\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}_{3}\)
C. \(\mathrm{C}_{3} \mathrm{H}_{7} \mathrm{OH}\)
D. \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\)

Question 464:

A metal M displaces zinc from zinc chloride solution. This shows that ____________

A. M is more electronegative than zinc
B. Zinc is above hydrogen in the series
C. Electrons flow from zinc to M
D. M is more electropositive than zinc

Question 465:

The process by which atoms are re-arranged into different molecular structures in the petroleum refining process is referred to as ____________

A. Polymerization
B. Hydrocracking
C. Reforming
D. Catalytic cracking