Waec Chemistry Past Questions For Year 1995
Question 6
Which of the following species is always present in acidified water?
- A. NH+4
- B. O 2-
- C. HCI
- D. H3O+
- E. HNO3
Question 7
A WEAK ACID IS ONE WHICH
- A. IS NOT CORROSIVE
- B. IS SLIGHTLY IONIZIED IN WATER
- C. DOES NOT PRODUCE SALTS WITH ALKALIS
- D. DOES NOT CONDUCT AN ELECTRIC CURRENT IN AQUEOUS SOLUTION
- E. FORMS ACID SALTS WITH BASES
Question 8
What is the percentage by mass of copper in copper in copper (l) oxide (CU2O)? [O = 16; CU =64]
- A. 88.9%
- B. 80.0%
- C. 66.7%
- D. 20.0%
- E. 11.1%
Question 9
What mass of copper will be deposited by the liberation of Cu2+ when 0.1F of electricity flows through an aqueous solution of a copper (ll) salt? [Cu = 64]
- A. 64g
- B. 32g
- C. 12.8g
- D. 6.4g
- E. 3.2g
Question 10
Sodium chloride cannot conduct electricity in the solid state because it
- A. is a normal salt
- B. is highly soluble in water
- C. is an electrovalent compound
- D. does not have any effect on litmus
- E. does not contain mobile ions
