Waec Chemistry 2015 Past Questions and Answers

Question 16:

• WAEC 2015

To which group and period respectively does an element with 15 electrons belong?

A. 3 and 3
B. 3 and 5
C. 5 and 3
D. 5 and 5

Question 17:

• WAEC 2015

The shape of a graphite crystal is

A. Tetrahedral
B. Pyramidal
C. Octahedral
D. Hexagonal

Question 18:

• WAEC 2015

Which of the following oxides is ionic?

A. P₄O₁₀
B. MgO
C. Al₂O₃
D. SO₂

Question 19:

• WAEC 2015

Which of the following substances when boiled with aqueous solution of sodium hydroxide would be hydrolyzed?
i. Protein ii. Fat iii. Polythene

A. I
B. Ii
C. I and ii
D. Ii and iii

Question 20:

• WAEC 2015

Which of the following trioxonitrate(V) salts would decompose on heating to form a metal?

A. Cu(NO₃)₂
B. AgNO₃
C. Pb(NO₃)₂
D. KNO₃