Chemistry 2004 Waec Past Questions and Answers

Question 16 :

• WAEC 2004

What are the values of x, y and z respectively in the following in the following equation? MnO _2(s) + xHCI_(aq) → MnCI_2(g) + yHO_(l) + zCI_2(g)

A. 4,1,2
B. 1,2,1
C. 2,1,2
D. 4,2,1

Question 17 :

• WAEC 2004

Which of the following subtances will not produce effervescence with dilute hydeochloric acid?

A. Copper (ll) trioxocarbonate (IV)
B. Potassium hydrogentrioxocarbonate (lV)
C. Zinc granules
D. Sodium chloride

Question 18 :

• WAEC 2004

What quantity of electrons in moles is needed to discharge two moles of aluminum from aluminum oxide (AI ₂O₃)

A. 1
B. 2
C. 4
D. 6

Question 19 :

• WAEC 2004

Two solutions containing Pb²⁺ and AI³⁺ respectively can be distingusihed using

A. NaOH_(aq)
B. NH_3(aq)
C. Conc. HCI₃
D. Conc. HCI

Question 20 :

• WAEC 2004

A solution of zinc chloride should not be stored in a container made of

A. Tin
B. Copper
C. Aluminium
D. Lead