Electrochemistry 539
1. The mass of copper deposited from a solution of
4
CuSO
by passage of 5 A current for 965 second is
(Mol. wt. of Copper = 63.5) [AIIMS 2001]
(a) 15.875 g (b) 1.5875 g
(c) 4825 g (d) 96500 g
2. The current in a given wire is 1.8 A. The number
of coulombs that flow in 1.36 minutes will be [AIIMS 2001]
(a) 100 C (b) 147 C
(c) 247 C (d) 347 C
3. A solution of a salt of a metal was electrolysed
for 150 minutes with a current of 0.15 ampere s.
The weight of metal deposited was 0.783 gm.
The equivalent wei ght of the metal is [AFMC 2001]
(a) 55.97 gm (b) 65.97 gm
(c) 75.97 gm (d) 85.97 gm
4. The resistance of 0.01N
NaCl
solution at
C
o
25
is
200 . Cell constant of conductivity cell is 1 cm–1.
The equivalent conductance is [CBSE PMT 1999]
(a)
1212
105
eqcm
(b)
1213
106
eqcm
(c)
1214
107
eqcm
(d)
1215
108
eqcm
5. Which of the following reaction is possible at
anode
[AIEEE 2002]
(a)
HOCrOHCr 1472 2
722
3
(b)
FF 2
2
(c)
OHHO 22 2
2
1
(d) None of these
6. What is the standard cell potential for the cell
CuMCuMZnZn /)1(||)1(/ 22
o
E
for
VCuCuVMZnZn 34.0/&76.0)1(/ 22
[AIIMS 1980]
(a)
V42.0)34.0(76.0
(b)
V42.076.034.0
(c)
V10.1)76.0(34.0
(d)
V10.1)34.0(76.0
7. Normal aluminium electrode coupled with normal
hydrogen electrode gives an
emf
of
volts66.1
. So
the standard electrode potential of aluminium is[KCET 1987]
(a) – 1.66 V (b) + 1.66 V
(c) – 0.83 V (d) + 0.83 V
8. Which one among the following is the strongest
reducing agent
)44.0(2
2VFeeFe
)25.0(2
2VNieNi
)14.0(2
2VSneSn
)77.0(
23 VFeeFe
[BHU 1998]
(a)
Fe
(b)
2
Fe
(c)
Ni
(d)
Sn
9. The cell reaction of the galvanic cell
)(
)(
2
)(
2
)( ||||l
aqaq
sHgHgCuCu
is [EAMCET 2003]
(a)
CuHgCuHg 22
(b)
HgCuCuHg 2
(c)
CuHgHgCu
(d)
HgCuHgCu 22
10. The specific conductivity of N/10
KCl
solution at
C
o
20
is
11
0212.0 cmohm
and the resistance of
cell containing this solution at
C
o
20
is 55 ohm.
The cell constant is
[AIIMS 1999]
(a) 1.166
1
cm
(b) 2.173
1
cm
(c) 3.324
1
cm
(d) 4.616
1
cm
11. The oxide which is not reduced by hydrogen is
