Post Utme Chemistry Past Questions and Answers

Question 61:

The most stable allotropic form of sulphur at normal conditions is ____________

A. Monoclinic sulphur
B. Rhombic sulphur
C. Amorphous sulphur
D. Plastic sulphur
E. Ordinary sulphur

Question 62:

The products obtained when the following chemical reaction is completed and balanced ____________

A. \(\mathrm{CaNO}_{3}+\mathrm{H}_{2} \mathrm{O}\)
B. \(\mathrm{Ca}(\mathrm{NO} 3)_{2}+2 \mathrm{H}_{2} \mathrm{O}\)
C. \(\mathrm{CaO}+2 \mathrm{NO}_{2}+3 \mathrm{H}_{2} \mathrm{O}\) are... \(\mathrm{HNO}_{3}+\mathrm{Ca}(\mathrm{OH})_{2} rightarrow\)
D. \(\mathrm{Ca}+2 \mathrm{NO}_{3}+2 \mathrm{H}_{2} \mathrm{O}\)

Question 63:

What is the role of iron and Aluminium oxide in ammonia production?

A. Dehydrating agent
B. Catalytic agent
C. Oxidizing agent
D. Bonding agent
E. Preservative agent

Question 64:

When carbon IV oxide is bubbled through lime water, the solution becomes milky due formation of ____________

A. \(\mathrm{Ca}\left(\mathrm{HCO}_{3} right)_{2}\)
B. \(\mathrm{CaCO}_{3}\)
C. \(\mathrm{Ca}\left(\mathrm{NO}_{3} right)_{2}\)
D. \(\mathrm{CaCl}_{2}\)
E. \(\mathrm{CaSO}_{4}\)

Question 65:

Which of the following gases dissolves in water vapour to produce acid rain during rainfall?

A. Oxygen
B. Carbon (II) oxide
C. Nitrogen
D. Sulphur (IV) oxide