Waec Chemistry 2009 Past Questions and Answers

Question 11:

• WAEC 2009

An element Q forms a compound QCI₅. In which group of the periodic table is Q?

A. L
B. Lll
C. V
D. VII

Question 12:

• WAEC 2009

Which of the statements about the behaviour of the atom is correct?

A. Atomic size decreases down the group
B. Atomic size increases across the period
C. Anions are smaller than the parent atom
D. Cations are smaller than the parent atom

Question 13:

• WAEC 2009

Which of the following properties of covalent compounds is not correct? They

A. Are non-electrolytes
B. Are mostly gaseous and volatile liquids
C. Have low melting point
D. Have high boiling points

Question 14:

• WAEC 2009

Which of the following arrangements is in order of increasing ionization energy?

A. AI, Si, P, S
B. Si, AI,S,P
C. S,P,Si,AI
D. P, Si,S,AI

Question 15:

• WAEC 2009

In bonded atoms, increase in electronegativity difference,

A. Increases polarity
B. Decreases polarity
C. Has no effect on polarity
D. Brings the polarity to zero