Chemistry 2007 Jamb Past Questions and Answers

Question 6 :

• JAMB 2007

The soft solder used for welding and plumbing is alloy of

A. Lead and tin
B. Iron and tin
C. Lead and zinc
D. Iron and zinc

Question 7 :

• JAMB 2007

The reddish-brown rust on iron roofing sheets consists of

A. Fe³⁺(H₂O)₆
B. FeO.H₂O
C. Fe₂O₃.3H₂O
D. Fe₃O₄.2H₂O

Question 8 :

• JAMB 2007

Na₂S₂O_3(aq) + 2HCl_(aq) → 2NaCl_(aq) + H₂O_(l)
Which of the following would introduce the greatest increase in the rate of the chemical reaction above?

A. An increase in temperature and decrease in the concentration of the reactant
B. A decrease in the volume and increase in the pressure of the reactant
C. A decrease in the temperature and an incease in the concentration of the reactant
D. An increase in temperature and an increase in the concentration of the reactant

Question 9 :

• JAMB 2007

The tincture of iodine means iodine dissolved in

A. Ethanol
B. Bromine chloride
C. Chlorine water
D. Water

Question 10 :

• JAMB 2007

Cu²⁺_(aq) + 4NH_3(g) ↔ [Cu(NH₃)₄]²⁺_(aq)
In the reaction above, what is the effect of precipitating Cu²⁺_(aq) as CuS_(s)?

A. NH_3(g) concentration will decrease
B. More NH_3(g)will be generated
C. The equilibrium will shift to the right
D. There will be no effect