Year : 
2007
Title : 
Chemistry
Exam : 
JAMB Exam

Paper 1 | Objectives

11 - 20 of 47 Questions

# Question Ans
11.

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

C
12.

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

A
13.

H3PO4(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

C
14.

The reaction that takes place in Daniell cell is

A. direct combination

B. redox

C. double decomposition

D. neutralization

B
15.

What happens when zinc rod is immersed in copper (II) tetraoxosulphate (VI) solution/

A. The blue colour of the solution disappears

B. Electrons flow from copper to zinc

C. The zinc rod remain undissolved

D. The copper generate more copper ions

A
16.

C2H4(g) + H2(g) → C2H6(g) ΔH = -137kJ mol-1
The reaction represented above is

A. exothermic

B. spontaneous

C. endothermic

D. in equilibrium

A
17.

How long would it take to deposit 0.08g of copper from CuCl2 solution by passing a current of 0.5A?
[Cu = 64, F = 96500 C mol-1]

A. 6 mins

B. 8 mins

C. 24 mins

D. 48 mins

Detailed Solution

Cu2+ + 2e → Cu(s)
2 * 96500C deposit 64g of Cu
∴ x quantity of electricity wil deposit 0.08
x = (2 * 96500 * 0.08)/64 =241.25 coulomb.
Q = It
241.25 = 0.5t
t = 241.25/60 = 8 mins
18.

Tartaric acid is used industrially to

A. make baking powder

B. make fruit juices

C. remove rust

D. dry substance

A
19.

The salt formed from strong acid and a strong base is?

A. complex

B. neutral

C. basic

D. acidic

Detailed Solution

Sodium chloride, which is obtained by neutralization of hydrochloric acid and sodium hydroxide, is a neutral salt.
Neutralization of any strong acid with a strong base always gives a neutral salt.
20.

Dissolving some pellets of NaOH in water would result in

A. a decrease in the free energy of the solution

B. a decrease in the entropy of the solution

C. a lowering of the temperature of te solution

D. an increase in the entropy of the solution

D
11.

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

C
12.

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

A
13.

H3PO4(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

C
14.

The reaction that takes place in Daniell cell is

A. direct combination

B. redox

C. double decomposition

D. neutralization

B
15.

What happens when zinc rod is immersed in copper (II) tetraoxosulphate (VI) solution/

A. The blue colour of the solution disappears

B. Electrons flow from copper to zinc

C. The zinc rod remain undissolved

D. The copper generate more copper ions

A
16.

C2H4(g) + H2(g) → C2H6(g) ΔH = -137kJ mol-1
The reaction represented above is

A. exothermic

B. spontaneous

C. endothermic

D. in equilibrium

A
17.

How long would it take to deposit 0.08g of copper from CuCl2 solution by passing a current of 0.5A?
[Cu = 64, F = 96500 C mol-1]

A. 6 mins

B. 8 mins

C. 24 mins

D. 48 mins

Detailed Solution

Cu2+ + 2e → Cu(s)
2 * 96500C deposit 64g of Cu
∴ x quantity of electricity wil deposit 0.08
x = (2 * 96500 * 0.08)/64 =241.25 coulomb.
Q = It
241.25 = 0.5t
t = 241.25/60 = 8 mins
18.

Tartaric acid is used industrially to

A. make baking powder

B. make fruit juices

C. remove rust

D. dry substance

A
19.

The salt formed from strong acid and a strong base is?

A. complex

B. neutral

C. basic

D. acidic

Detailed Solution

Sodium chloride, which is obtained by neutralization of hydrochloric acid and sodium hydroxide, is a neutral salt.
Neutralization of any strong acid with a strong base always gives a neutral salt.
20.

Dissolving some pellets of NaOH in water would result in

A. a decrease in the free energy of the solution

B. a decrease in the entropy of the solution

C. a lowering of the temperature of te solution

D. an increase in the entropy of the solution

D