Post Utme Chemistry Past Questions and Answers

Question 146:

In the electrolysis of brine, it is essential to prevent the mixing of the products because ____________

A. Sodium and chlorine readily combine
B. Chlorine gives a green coloration
C. Chlorine readily recombines with sodium hydroxide
D. Sodium hydroxide forms a carbonate in the presence of air and chlorine

Question 147:

In what way is equillibrum constant for the reaction related to that of the reverse reaction?

A. The two equilibrium constants are identical
B. The product of the two is always greater than one
C. The product of the two is expected to be one
D. The addition of the two is expected to be one

Question 148:

When chlorine water is exposed to sunlight, the gas evolved is ____________

A. \(\mathrm{Cl}_{2}\)
B. \(\mathrm{O}_{2}\)
C. \(\mathrm{HCl}\)
D. \(\mathrm{CO}_{2}\)

Question 149:

\(\mathrm{PbCl}_{2}\) does not dissolve in liquid ammonia while \(\mathrm{AgCl}\) does. This is because ____________

A. \(\mathrm{Pb}\) is not a transition metal while Ag is
B. Ag is not a transition metal while Pb is
C. AgCl turns grey on exposure to light
D. \(\mathrm{AgCl}\) dissolves in hot water

Question 150:

When sodium hydroxide pellets are exposed to the atmosphere, the first gas they absorb is ____________

A. \(\mathrm{CO}_{2}\)
B. Water vapour
C. Oxygen
D. Nitrogen