Post Utme Chemistry Past Questions and Answers

Question 251:

In the laboratory preparation of oxygen, dried oxygen is usually it is collected over

A. Mercury
B. Calcium chloride
C. Tetraoxosulphate(VI) acid
D. Hydrochloric acid

Question 252:

The elements that belong to the third period, of the periodic table are ____________

A. Li, Be, Al and P
B. Na, P, O and CI
C. B, C, N and O
D. Na, Mg, S and Ar

Question 253:

Synthetic gas is a mixture of ____________

A. \(\mathrm{CH}_{4}\) and \(\mathrm{H}_{2} \mathrm{O}\)
B. \(\mathrm{CH}_{4}\) and \(\mathrm{H}_{2}\)
C. \(\mathrm{CO}_{2}\) and \(\mathrm{H}_{2}\)
D. \(\mathrm{CO}\) and \(\mathrm{H}_{2}\)

Question 254:

Which of the following is a neutralization reaction? The addition of ____________

A. Nitric acid to hydrochloric acid
B. Nitric acid to distilled water
C. Nitric acid to sodium hydroxide
D. Sodium hydroxide to distilled water

Question 255:

A metal \(X\) forms two bromides with formulae \(\mathrm{XBr}_{2}\) and \(\mathrm{Xbr}_{3}\). What type of bonding exists,between X and bromine in the bromides?

A. Metallic bonding
B. Ionic bonding
C. Covalent bonding
D. Dative bonding