Waec Chemistry 2019 Past Questions and Answers

Question 6:

• WAEC 2019

Which of the following metals reacts slowly with cold water?

A. Iron
B. Silver
C. Calcium
D. Pottassium

Question 7:

• WAEC 2019

which of the following elements has the highest ionization energy?

A. Calcium
B. Chlorine
C. Flourine
D. Magnesium

Question 8:

• WAEC 2019

The bleaching action of chlorine is through the process?

A. Hydration
B. Hydrolysis
C. Reduction
D. Oxidation

Question 9:

• WAEC 2019

If 6.5g of magnesium ribbon reacts completely with Hydrochloric acid, how many grams of hydrogen gas would be liberated?
Mg(s) + 2 HCl(aq) --> MgCl 2(aq) + H 2(g)
[ H = 1.0, Mg = 24.0 ]

A. 0.54g
B. 0.70g
C. 1.08g
D. 1.40g

Question 10:

• WAEC 2019

Calcium and magnesium belong to the group of the periodic table because both?

A. Are metals
B. Form cations
C. Form colourless salts
D. Have same number of valence electrons