Waec Chemistry Past Questions
Question 26
Which of the following metals cannot extracted from its ore by using carbon (ll) oxide as the reducing agent?
- A. Cu
- B. Zn
- C. Al
- D. Pb
- E. Fe
Question 27
Water gas is a mixture of?
- A. CO2 and H2
- B. CO and H2O
- C. CO2 and CO
- D. CO and N2
- E. CO and H2
Question 28
How many isomers can be obtained from C4H10?
- A. o
- B. 1
- C. 2
- D. 3
- E. 4
Question 29
The complex salt formed when aluminium dissolves in sodium hydroxide solution is
- A. Na3AI(OH)4
- B. Na2AI(OH)3
- C. NaAI(OH)3
- D. Na4AI(OH)4
- E. NaAI(OH)4
Question 30
When copper (ll) chloride solution is treated with excess aqueous ammonia, a deep blue solution results This is due to the presence of
- A. (CuNH4)3+ ions
- B. (CuCI4)2-ions
- C. [Cu(OH)4]2- ions
- D. Cu(H2-O)42+ IONS
- E. [cU(NH3)4] ions
