Waec Chemistry 2002 Past Questions and Answers

Question 1:

• WAEC 2002

If the relative molecular mass of an element is not a whole number, it can be deduced that the element is

A. Naturally radioactive
B. Abundant in nature
C. A transition metal
D. An isotopic mixture

Question 2:

• WAEC 2002

If the relative molecular mass of an element is not a whole number, it can be deduced that the element is

A. Naturally radioactive
B. Abundant in nature
C. A transition metal
D. An isotopic mixture

Question 3:

• WAEC 2002

The atomic number of chlorine is 17. What is the number of electrons in a chloride ion?

A. 16
B. 17
C. 18
D. 19

Question 4:

• WAEC 2002

Consider the following equation; Cr₂O_7(aq)^2- + 14H⁺_(aq) + 6e^- → 2Cr³⁺_(aq) + 7H₂O_(I). The oxidation number of chromium changes from

A. -2 to + 3
B. - 2 to + 6
C. + 6 to + 3
D. + 7 to + 6

Question 5:

• WAEC 2002

Which of the following ions require the largest quantity of electricity for discharge at an electrode?

A. 2.0 mole of Q ³⁺
B. 2.5 mole of R²⁺
C. 4.0 mole of Y^-
D. 3.0 mole of T^-[sup][/sup]