2000 - JAMB Chemistry Past Questions and Answers - page 4
32
1.0 dm3 of distilled water was used to wash 2.0g of a precipitate of AgCl. If the solubility product of AgCl is 2.0 * 10-10mol2dm-6, what quantity of silver was lost in the process?
A
2.029 * 10-3mol dm-3
B
1.414 * 10-3mol dm-3
C
2.029 * 10-5mol dm-3
D
1.414 * 10-5mol dm-3
correct option: d
Users' Answers & Comments33
Hydration of ions in solution is associated with
A
absorption of heat
B
reduction of heat
C
conduction of heat
D
liberation of heat
correct option: d
Users' Answers & Comments34
HCL(aq) + H2O(l) H3O+(aq) + Cl-(aq)
In the reaction above, Cl-(aq) is the
In the reaction above, Cl-(aq) is the
A
conjugate acid
B
acid
C
conjugate base
D
base
correct option: c
Users' Answers & Comments35
In which order are the following salts sensitive to light?
A
Agl > AgCl > AgBr
B
AgCl > Agl > AgBr
C
AgBr > AgCl > Agl
D
AgCl > AgBr > Agl
correct option: d
Users' Answers & Comments36
The pOH of a solution of 0.25 mol dm-3 of hydrochloric acid is
A
12.40
B
13.40
C
14.40
D
14.60
37
MnO4(aq) + 8H+(aq) + Y → Mn2+(aq) + 4H2O(l)
Y in the equation above represents
Y in the equation above represents
A
2e-
B
3e-
C
5e-
D
7e-
correct option: c
Users' Answers & Comments38
(1/2)Zn2+(aq) + e- → (1/2) Zn(s)
In the reaction above, calculate the quantity of electricity required to discharge zinc.
[F = 96 500 C mol-1]
In the reaction above, calculate the quantity of electricity required to discharge zinc.
[F = 96 500 C mol-1]
A
0.965 * 104C
B
4.820 * 104C
C
9.650 * 104C
D
48.200 * 104C
correct option: c
1 mol → 96500 * 2
0.5 mol → X
X = 0.5 * 96500 * 2
= 9.650 * 104C
Users' Answers & Comments0.5 mol → X
X = 0.5 * 96500 * 2
= 9.650 * 104C
39
Given that M is the mass of substance deposited in an electrolysis and Q the quantity of electricity consumed, then Faraday's law can be written as
A
M = Z/Q
B
M = Q/Z
C
M = Z/2Q
D
M = QZ
correct option: d
Users' Answers & Comments40
0.46g of ethanol when burned raised the temperature of 50g of water by 14.3K. Calculate the heat of combustion of ethanol.
[C = 12, O = 16, H = 1, Specific heat capacity of water = 4.2 jg-1K-1]
[C = 12, O = 16, H = 1, Specific heat capacity of water = 4.2 jg-1K-1]
A
+3000 KJ mol-1
B
+300 KJ mol-1
C
-300 KJ mol-1
D
-3000 KJ mol-1