Waec Chemistry 2008 Past Questions and Answers

Question 1:

• WAEC 2008

The mass spectrometer can be used to measure mass of

A. An atom
B. An electron
C. A proton
D. A neutron

Question 2:

• WAEC 2008

The mass spectrometer can be used to measure mass of

A. An atom
B. An electron
C. A proton
D. A neutron

Question 3:

• WAEC 2008

Find the number of neutrons in an atom represented by 45₂₁X.

A. 21
B. 24
C. 45
D. 66

Question 4:

• WAEC 2008

The valence electrons in a chloride ion are [₁₇CI]

A. 2p electrons only
B. 3s and 3p electrons only
C. 3p and 3d electrons only
D. 3p electrons only

Question 5:

• WAEC 2008

What is the atomic number of an element whose cation Y⁺ has the electronic configuration 1s²2s²2p⁶?

A. 9
B. 10
C. 11
D. 12