Waec Chemistry 2017 Past Questions and Answers

Question 6:

• WAEC 2017

The seperation of Nitrogen from oxygen using fractional distillation of air is possible because

A. Nitrogen is less dense than oxygen
B. Oxygen is more reactive than nitrogen
C. Of the difference in their boiling points
D. They belong to the same period

Question 7:

• WAEC 2017

The purity of a solid sample can best be determined by its

A. Boiling point
B. Melting point
C. Conductivity
D. Solubility

Question 8:

• WAEC 2017

The mass of one mole of \((NH_{4})_{2}CO_{3}\) is [O=16.0, N=14.0, C=12.0, H=1.0]

A. 66.0g
B. 76.0g
C. 80.0g
D. 96.0g

Question 9:

• WAEC 2017

Atomic orbital is

A. The circular path through which electrons revolve round the nucleus
B. A region around the nucleus where electrons are most likely to be found
C. The path around the nucleus through which electrons move
D. The path around the nucleus through which protons move

Question 10:

• WAEC 2017

The property of elements which increases down a group of the periodic table is

A. Electronegativity
B. Electron affinity
C. Ionic radius
D. Ionization energy