Waec Chemistry 1999 Past Questions and Answers

Question 6:

• WAEC 1999

Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore

A. S decays faster than Q
B. Q is twice as stable as S
C. Q emits fewer particles than S
D. S is more stable than Q

Question 7:

• WAEC 1999

Calcium atom ionizes by

A. Gaining two electrons
B. Losing two electrons
C. Sharing two electrons
D. Gaining two protons

Question 8:

• WAEC 1999

Which of the following properties increases down a group in the Periodic Table?

A. Atomic radius
B. Electronegativity
C. Electon affinity
D. Ionization energy

Question 9:

• WAEC 1999

In the Periodic Table, the elements that loss electrons most readily belong to

A. Group 1 A
B. Group 11 A
C. Group 111 A
D. Group V11 A

Question 10:

• WAEC 1999

Which of the following reactions is not feasible?

A. Cl₂ + 2Kl → 2KCI + I₂
B. Cl₂ + 2NaF → 2NaCI + F₂
C. Zn + CuCI₂ ZnCl₂ + Cu
D. Zn + 2AgNO₃ → Zn(NO₃)₂ + 2Ag