Chemistry 2007 Jamb Past Questions and Answers

Question 11 :

• JAMB 2007

Copper and silver metals are commonly use as coin because they are

A. Easily reduced
B. Not easily reduced
C. Easily oxidized
D. Not easily oxidized

Question 12 :

• JAMB 2007

Which of the following sets of metals dissolves in dilute HCl?

A. Fe, Sn and Cu
B. Mg, Fe and Cu
C. Mg, Sn and Fe
D. Cu, Mg and Sn

Question 13 :

• JAMB 2007

If chlorine is bubbled into water and the resulting yellowish-green solution is exposed to bright sunlight for a while, the solution will decompose giving out

A. Oxygen and leaving behind aqueous hydrochloric acid
B. Chlorine and oxygen
C. Oxygen, hydrogen and chlorine
D. Oxygen, thereby producing hypochlorous acid

Question 14 :

• JAMB 2007

H₃PO_4(aq) + H₂O_(l) ↔ H₂PO₄^-_(aq) + H₃O⁺_(aq)
ΔH = -13kJ at 298K
In the reaction above, an increase in temperature would

A. Slow downthe reverse reaction
B. Have no effect on the reaction
C. Favour the reverse reaction
D. Favour the forward reaction

Question 15 :

• JAMB 2007

The reaction that takes place in Daniell cell is

A. Direct combination
B. Redox
C. Double decomposition
D. Neutralization