Post Utme Economics Past Questions and Answers

Question 936:

Which of the following can sublime ____________

A. Water
B. Ink
C. Iodine
D. Hydrogen

Question 937:

A certain compound on analysis gave \(2.02 \mathrm{~g}\) of carbon, \(0.35 \mathrm{~g}\) of hydrogen and \(2.68 \mathrm{~g}\) of oxygen.

If the molecular mass is 90 , calculate the molecular formulA, If the molecular mass is 90 , calculate the molecular formula.

A. \(\mathrm{CH}_2 \mathrm{O}\)
B. \(\mathrm{C}_2 \mathrm{H}_4 \mathrm{O}_2\)
C. \(\mathrm{C}_3 \mathrm{H}_6 \mathrm{O}_3\)
D. \(\mathrm{C}_4 \mathrm{H}_8 \mathrm{O}_4\)

Question 938:

Isotopy is due to differences in the number of ____________

A. Atomic mass
B. Molecular mass
C. Protons
D. Neutrons

Question 939:

Chlorine is ____________

A. Colourless gas
B. Greenish liquid
C. Yellow gas
D. Greenish yellow gas

Question 940:

calcium carbide reacts with water to form ethyne. What mass of calcium carbide (grams) would react to give \(1.2 \mathrm{dm}^3\) of ethyne at STP? \([\mathrm{Ca}=40, \mathrm{C}=12, \mathrm{H}=1]\)

A. \(60 \mathrm{~g}\)
B. \(64 \mathrm{~g}\)
C. \(32 \mathrm{~g}\)
D. \(3.2 \mathrm{~g}\)