Waec Chemistry 2010 Past Questions and Answers

Question 6:

• WAEC 2010

If X is a group lll element, its oxide would be represented as

A. X₃O₂
B. X₃O
C. X₂O₃
D. XO₃

Question 7:

• WAEC 2010

Which of the following species correctly represented an ion of M with 13 protons and 10 electrons?

A. ₁₀M ³⁺
B. ₁₀M ^3-
C. ₁₃M ³⁺
D. ₁₃M ^3-

Question 8:

• WAEC 2010

A solid substance with high melting and boiling points is likely to be a/an

A. Covalent compound
B. Dative covalent compound
C. Electrovalent compound
D. Non-metal

Question 9:

• WAEC 2010

Which of the following molecules has a linear shape?

A. CH₄
B. CO ₂
C. H₂S
D. NH ₃

Question 10:

• WAEC 2010

Which of the following molecules has a triple bond in its structure?

A. CH₄
B. NH₃
C. N₂
D. O ₂