Post Utme Chemistry Past Questions and Answers

Question 351:

The rate of a reaction is proportional to the number of effective collisions occurring per second between the reactants"
This statement is associated with the ____________

A. Kinetic theory
B. Rate faw
C. Atomic theory
D. Collision theory

Question 352:

In the reaction represented by the following equation; \(2 \mathrm{H}_{2} \mathrm{~S}_{\mathrm{an} \mid}+\mathrm{SO}_{2 \mathrm{a}} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}_{\mathrm{Hi}}+3 \mathrm{~S}_{(\mathrm{e}} \mathrm{SO} \mathrm{O}_{2}\) is acting as ____________

A. A reducing agent.
B. An oxidizing agent
C. A dehydrating agent
D. A bleaching agent.

Question 353:

When iron rusts, it undergoes ____________

A. Chemical decomposition
B. Hydrolysis.
C. Redox reaction,
D. Combustion.

Question 354:

The following salts are readily soluble in water except ____________

A. \(\mathrm{Na}_{2} \mathrm{CO}_{4} \quad\)
B. \(\mathrm{~Pb}\left(\mathrm{NO}_{3}\right)_{4} \quad\)
C. \(\mathrm{KCl}\)
D. \(\mathrm{FeSO}_{4}\)

Question 355:

When sucrose is warmed with Fehling's solution ____________

A. A silver minor is produced.
B. Solution turns milky.
C. Brick-red precipitate is formed
D. There is no precipitate.