Post Utme Chemistry Past Questions and Answers

Question 421:

Metalloids are also referred to as ____________

A. Semi metals
B. Metals
C. Colloids
D. Non-metals

Question 422:

The ores that can be concentrated by flotation are ____________

A. Nitride ores
B. Sulphide ores
C. Oxide ores
D. Chloride ores

Question 423:

A compound contains 40% carbon, 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180, find the molecular formula.
\((H=1, C=12, O=16)\)

A. \(\mathrm{CH}_{2} \mathrm{O}\)
B. \(\mathrm{C}_{6} \mathrm{H}_{6} \mathrm{O}_{3}\)
C. \(\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}\)
D. \(\mathrm{C}_{6} \mathrm{H}_{6} \mathrm{O}_{3}\)

Question 424:

Aluminium hydroxide is used in the dyeing industry as a ____________

A. Salt
B. Dye
C. Mordant
D. Dispersant

Question 425:

Air element that occurs in the free state is ____________

A. Pb
B. K
C. Al
D. Ar
E. C