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Standard XII
Chemistry
Ores and Minerals
Sulfide ores ...
Question
Sulfide ores are common for the metals:
A
Ag, Cu and Pb
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B
Ag, Cu and Sn
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C
Ag, Mg and Pb
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D
Al, Cu and Pb
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Solution
The correct option is
D
Ag, Cu and Pb
Following are the sulfide ores of the metals:
For
A
g
, it is Argentite
(
A
g
2
S
)
.
For
P
b
, it is Galena
(
P
b
S
)
.
For
C
u
, it is Copper glance
(
C
u
2
S
)
.
Hence, option
A
is correct.
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Similar questions
Q.
L
i
,
K
,
C
a
,
N
a
,
M
g
,
A
l
,
Z
n
,
F
e
,
P
b
,
C
u
,
H
g
,
A
g
I
. The reaction
Z
n
(
s
)
+
C
u
(
N
O
3
)
2
(
a
q
)
→
C
u
(
s
)
+
Z
n
(
N
O
3
)
2
(
a
q
)
will occur.
I
I
. Zinc and copper are both transition metals.
Q.
The standard reduction potentials (in V) of a few metal ion/metal electrodes are given below.
The reducing strength of the metals follows the order.
Q.
Sulphide ore is common for _______ metal. (Cu, Mg, Na, K)
Choose the correct one.
Q.
Given:
P
b
+
C
u
(
N
O
3
)
2
→
P
b
(
N
O
3
)
2
+
C
u
C
u
+
A
g
(
N
O
3
)
2
→
C
u
(
N
O
3
)
2
+
A
g
Z
n
+
P
b
(
N
O
3
)
2
→
Z
n
(
N
O
3
)
2
+
P
b
The least reactive metal is,
Q.
An aqueous solution containing one mole per litre of each
C
u
(
N
O
3
)
2
,
A
g
N
O
3
,
H
g
2
(
N
O
3
)
2
and
M
g
(
N
O
3
)
2
, is being electrolysed by using inert electrodes. The values of standard electrode potentials in volts (reduction potentials) are
A
g
/
A
g
+
=
+
0.80
,
2
H
g
/
H
g
2
+
2
=
+
0.79
,
C
u
/
C
u
2
+
=
+
0.34
,
M
g
/
M
g
2
+
=
−
2.37
with increasing voltage, the sequence of deposition of metals on the cathode will be
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