Chemistry 2011 Waec Past Questions and Answers

Question 6 :

• WAEC 2011

An element with the electron configuration of 1s ²2s ²2p ⁶ would have a combining power of

A. O
B. 2
C. 6
D. 8

Question 7 :

• WAEC 2011

Rare gases are stable because they

A. Contain equal number of protons and neutrons
B. Contain more electrons than protons
C. Are chemically active
D. Have octet structure

Question 8 :

• WAEC 2011

Which of the following elements would produce coloured ions in aqueous solution?

A. Calcium
B. Lron
C. Magnesium
D. Sodium

Question 9 :

• WAEC 2011

The energy change that accompanies the addition of an electron to an isolated gaseous atom is

A. Bond energy
B. Electronegativity
C. Electron affinity
D. Ionization energy

Question 10 :

• WAEC 2011

Which of the following hydrohalic acids is the weakest?

A. HBr
B. HCI
C. HF
D. HI