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Muhammad Arafath R Z
Subject: Chemistry
, asked on 18/4/18
Electrochemistry mains online 2018:
Q
.
38
G
i
v
e
n
i
2
F
e
2
O
3
s
→
4
F
e
s
+
3
O
2
g
;
△
r
G
°
=
+
1487
.
0
k
J
m
o
l
-
1
i
i
2
C
O
g
+
O
2
g
→
2
C
O
2
g
;
△
r
G
°
=
+
1
-
514
.
4
k
J
m
o
l
-
1
F
r
e
e
e
n
e
r
g
y
c
h
a
n
e
,
△
r
G
°
f
o
r
t
h
e
r
e
a
c
t
i
o
n
2
F
e
2
O
3
s
+
6
C
O
g
→
4
F
e
s
+
6
C
O
2
g
w
i
l
l
b
e
:
O
p
t
i
o
n
s
1
.
-
112
.
4
k
J
m
o
l
-
1
2
.
-
56
.
2
k
J
m
o
l
-
1
3
.
-
208
.
0
k
J
m
o
l
-
1
4
.
-
168
.
2
k
J
m
o
l
-
1
Answer
1
Muhammad Arafath R Z
Subject: Chemistry
, asked on 18/4/18
Chemistry states of Matter online mains 2018
Q.1.
∆
f
G
°
at 500 K for substance 'S' in liquid state and gaseous state are + 100.7 kcal
m
o
l
-
1
and + 103 kcal
m
o
l
-
1
, respectively. Vapour pressure of liquid 'S' at 500 K is approximately equal to :
(R=2 cal
K
-
1
m
o
l
-
1
)
1. 100 atm
2. 0.1 atm
3. 1 atm
4. 10 atm
Answer
1
Laieeqa
Subject: Chemistry
, asked on 16/4/18
Solve this:
35. The emf of a galvanic cell constituted with the electrodes
Zn
2
+
Zn
-
0
.
76
V
and
Fe
2
+
Fe
-
0
.
41
V
is
(1) -0.35 V (2) +1.17 V
(3) +0.35V (4) -1.17 V
Answer
1
Jeneeta Eliza John
Subject: Chemistry
, asked on 15/4/18
Why is (2) wrong? Ans given is (4)
Answer
1
Jeneeta Eliza John
Subject: Chemistry
, asked on 15/4/18
How do we find the oxidisation number of Nitrogen in Nitrobenzene and Aniline?
Answer
1
Tulsi Mehta
Subject: Chemistry
, asked on 14/4/18
Why is the eqn written like that ?
Answer
2
Yashi Mishra
Subject: Chemistry
, asked on 9/4/18
Solve giving all steps
Q.53. Volume of gases evolved when dil.
H
2
S
O
4
is electrolysed using 2 F at STP
(1) 22.4 L
(2) 11.2 L
(3) 33.6 L
(4) 44.8 L
Answer
1
Shreya Choudhary
Subject: Chemistry
, asked on 8/4/18
How 2 is the correct option not 1?
29. An equilibrium mixture of the reaction
2
H
2
S
g
⇌
2
H
2
(
g
)
+
S
2
g
had 0.5 mole
H
2
S
,
0
.
10
m
o
l
e
H
2
a
n
d
0
.
4
m
o
l
e
S
2
in one litre vessel. The value of equilibrium constant (K) in mole litre
-1
is
1. 0.016 2. 0.008 3. 0.004 4. 0.160
Answer
1
Shreya Choudhary
Subject: Chemistry
, asked on 8/4/18
For the reaction, 1 g mole of CaCO3?is enclosed in 5L container?
? ?CaCO?3(s)????CaO(s) + CO?2(g)?
? ? ?K?p?= 1.16 at 1073 K then per cent dissociation of CaCO?3?is??
? ?(1) Zero? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?(2) 6.58%?
? ?(3) 65%? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?(4) 100%
Answer
1
Shreya Choudhary
Subject: Chemistry
, asked on 8/4/18
Solve this:
36
.
A
t
t
h
e
e
q
u
i
l
i
b
r
i
u
m
o
f
t
h
e
r
e
a
c
t
i
o
n
,
N
2
O
4
⇌
2
N
O
2
(
g
)
,
t
h
e
o
b
s
e
r
v
e
d
m
o
l
a
r
m
a
s
s
o
f
N
2
O
4
i
s
77
.
70
g
m
o
l
-
1
.
T
h
e
p
e
r
c
e
n
t
a
g
e
d
i
s
s
o
c
i
a
t
i
o
n
o
f
N
2
O
4
i
s
(1) 28.4 (2) 46.7 (3) 22.4 (4) 18.4
Answer
1
Tulsi Mehta
Subject: Chemistry
, asked on 7/4/18
2.
Answer
1
Tulsi Mehta
Subject: Chemistry
, asked on 7/4/18
C
a
l
c
u
l
a
t
e
E
M
F
o
f
t
h
e
f
o
l
l
o
w
i
n
g
c
e
l
l
a
t
25
°
C
A
g
s
|
A
g
+
10
-
3
M
|
|
C
u
2
+
10
-
1
M
|
C
u
s
.
G
i
v
e
n
E
o
c
e
l
l
=
0
.
46
V
Answer
1
Aparna Sahu
Subject: Chemistry
, asked on 5/4/18
21) The amount of silver (at. mass = 108) deposited from a solution of silvernitrate when a current of 965 couloms was passed is .
(a) 10. 8 g
(b) 10.8
×
10
3
(c) 1.08 g
(d) 0.108 g
Answer
1
Prajnesha Singh
Subject: Chemistry
, asked on 5/4/18
35
Answer
1
Aparna Sahu
Subject: Chemistry
, asked on 5/4/18
Hydrogen reacts with nitrogen to form ammonia as:
N
2
(
g
)
+
3
H
2
(
g
)
→
2
N
H
3
(
g
)
The amount of ammonia that would be produced if 200g of
H
2
react is
(a) 1032.2g
(b) 1132.2g
(c) 11322g
(d) 8692.6g
Answer
1
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Next
What are you looking for?
Q.1. at 500 K for substance 'S' in liquid state and gaseous state are + 100.7 kcal and + 103 kcal , respectively. Vapour pressure of liquid 'S' at 500 K is approximately equal to :
(R=2 cal )
1. 100 atm
2. 0.1 atm
3. 1 atm
4. 10 atm
35. The emf of a galvanic cell constituted with the electrodes is
(1) -0.35 V (2) +1.17 V
(3) +0.35V (4) -1.17 V
Q.53. Volume of gases evolved when dil. is electrolysed using 2 F at STP
(1) 22.4 L
(2) 11.2 L
(3) 33.6 L
(4) 44.8 L
29. An equilibrium mixture of the reaction
had 0.5 mole in one litre vessel. The value of equilibrium constant (K) in mole litre-1 is
1. 0.016 2. 0.008 3. 0.004 4. 0.160
? ?CaCO?3(s)????CaO(s) + CO?2(g)?
? ? ?K?p?= 1.16 at 1073 K then per cent dissociation of CaCO?3?is??
? ?(1) Zero? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?(2) 6.58%?
? ?(3) 65%? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?(4) 100%
(1) 28.4 (2) 46.7 (3) 22.4 (4) 18.4
(a) 10. 8 g
(b) 10.8 103
(c) 1.08 g
(d) 0.108 g
The amount of ammonia that would be produced if 200g of react is
(a) 1032.2g
(b) 1132.2g
(c) 11322g
(d) 8692.6g