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Aparna Sahu
Subject: Chemistry
, asked on 20/4/18
Q.54. In transforming 0.01 mole PbS to
P
b
S
O
4
, the volume of 10 volume
H
2
O
2
required will be
(a) 11.2 ml
(b) 22.4 ml
(c) 33.6 ml
(d) 44.8 ml
Answer
2
Aparna Sahu
Subject: Chemistry
, asked on 20/4/18
Solve this:
Q40. A compound is formed of two univalent atoms of elements M & A. The bond distance is 1 Å. If the observed dipole moment is 3.6 D, what is the % of ionic character?
(a) 50
(b) 90
(c) 25
(d) 75
Answer
1
Aparna Sahu
Subject: Chemistry
, asked on 19/4/18
Solve 73
73
.
T
h
e
a
m
o
u
n
t
o
f
N
2
l
i
b
e
r
a
t
e
d
a
t
S
T
P
o
n
d
i
s
s
o
c
i
a
t
i
o
n
o
f
8
g
m
o
f
N
H
4
N
O
2
i
s
(a) 3.8 litre (b) 22.4 litre
(c) 4. litre (d) 2.8 litres
Answer
1
Aparna Sahu
Subject: Chemistry
, asked on 19/4/18
Solve this.
Q79. In a saturated solution of CaF
2
, the concentration of F' ion is 0.0076 g/ litre. Find out the solubility product of CaF
2.
(a) 2.19 ×
10
-
2
7
(b) 0.00228
(c) 5.78 × 10
–5
(d) 3.2 × 10
–11
Answer
1
Muhammad Arafath R Z
Subject: Chemistry
, asked on 18/4/18
Solutions Online mains 2018
Q26.
Two 5 molal solutions are prepared by dissolving a non-electrolyte non-volatile solute separately in the solvents X and Y. The molecular weights of the solvents are M
X
and M
Y
, respectively where
M
X
=
3
4
M
Y
.
The relative lowering of vapour pressure of the solution in X is "m" times that of the solution in Y. Given that the number of moles of solute is very small in comparison to that of solvent, the value of "m" is :
1
.
4
3
2
.
3
4
3
.
1
4
4
.
1
2
Answer
1
Muhammad Arafath R Z
Subject: Chemistry
, asked on 18/4/18
Solutions online 2018 mains
Q2
Following four solutions are prepared by
mixing different volumes of NaOH and
HCl of different concentrations, pH of
which one of them will be equal to 1 ?
1
)
60
m
L
M
10
H
C
l
+
40
m
L
M
10
N
a
O
H
2
)
50
m
L
M
10
H
C
l
+
45
m
L
M
10
N
a
O
H
3
)
75
m
L
M
10
H
C
l
+
25
m
L
M
10
N
a
O
H
4
)
100
m
L
M
10
H
C
l
+
100
m
L
M
10
N
a
O
H
Answer
1
Laieeqa
Subject: Chemistry
, asked on 16/4/18
Solve this:
Q. 3 gms of urea is dissolved in 45 gms of H
2
O. The relative lowering in vapour pressure is.
(1) 0.05 (2) 0.04
(3) 0.02 (4) 0.01
Answer
1
Laieeqa
Subject: Chemistry
, asked on 16/4/18
Solve this:
5. The mass of 112 cm
3
of NH
3
gas at STP is
(1) 0.085 g (2) 0.850 g
(3) 8.500 g (4) 80.500 g
Answer
1
Laieeqa
Subject: Chemistry
, asked on 16/4/18
Solve this:
Q. The mass of glucose that should be dissolved in 50 g of water in order to produce the same lowering of vapour pressure as is produced by dissolving 1 g of urea in the same quantity of water is
1) 1 g 2) 3 g
3) 6 g 4) 18 g
Answer
1
Laieeqa
Subject: Chemistry
, asked on 16/4/18
Solve this:
Q.4. Molar heat of vaporisation of a liquid is 6 kJ
m
o
l
e
-
1
. If the entropy change is 16 J
m
o
l
e
-
1
K
-
1
, the boiling point of the liquid is .........
1) 375
°
C
2) 375 K
3) 273 K
4) 102
°
C
Answer
1
Laieeqa
Subject: Chemistry
, asked on 16/4/18
Solve this:
46. A solution of two liquids boils at a temperature more than the boiling point of either of them. Hence, the binary solution shows ..............
1) negative deviation from Raoult's law
2) positive deviation from Raoult's law
3) no deviation from Raoult's law
4) positive or negative deviation from Raoult's law depending upon the composition
Answer
3
Laieeqa
Subject: Chemistry
, asked on 16/4/18
Solve this:
Q.1. 25
c
m
3
of oxalic acid completely neutralised 0.064 g of sodium hydroxide. Molarity of the oxalic acid solution is
(1) 0.045
(2) 0.032
(3) 0.064
(4) 0.015
Answer
1
Yagyam Aggarwal
Subject: Chemistry
, asked on 16/4/18
Solve this:
Answer
1
Yagyam Aggarwal
Subject: Chemistry
, asked on 16/4/18
Pls answer Q6
Answer
1
Royel Ghost
Subject: Chemistry
, asked on 13/4/18
solve QUESTION NO 4....fast...
4.
What concentration of nitrogen should be present in a glass of water at room temperature ? Assume a temperature of
25
°
C
a total pressure of 1 atmosphere and mole fraction of nitrogen in air as 0.78 [K
H
nitrogen =
8
.
42
×
10
-
7
M/mm Hg]
Answer
1
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Next
What are you looking for?
(a) 11.2 ml
(b) 22.4 ml
(c) 33.6 ml
(d) 44.8 ml
Q40. A compound is formed of two univalent atoms of elements M & A. The bond distance is 1 Å. If the observed dipole moment is 3.6 D, what is the % of ionic character?
(a) 50
(b) 90
(c) 25
(d) 75
(a) 3.8 litre (b) 22.4 litre
(c) 4. litre (d) 2.8 litres
Q79. In a saturated solution of CaF2, the concentration of F' ion is 0.0076 g/ litre. Find out the solubility product of CaF2.
(a) 2.19 × (b) 0.00228
(c) 5.78 × 10–5 (d) 3.2 × 10–11
Q26. Two 5 molal solutions are prepared by dissolving a non-electrolyte non-volatile solute separately in the solvents X and Y. The molecular weights of the solvents are MX and MY, respectively where The relative lowering of vapour pressure of the solution in X is "m" times that of the solution in Y. Given that the number of moles of solute is very small in comparison to that of solvent, the value of "m" is :
Q2 Following four solutions are prepared by
mixing different volumes of NaOH and
HCl of different concentrations, pH of
which one of them will be equal to 1 ?
Q. 3 gms of urea is dissolved in 45 gms of H2O. The relative lowering in vapour pressure is.
(1) 0.05 (2) 0.04
(3) 0.02 (4) 0.01
5. The mass of 112 cm3 of NH3 gas at STP is
(1) 0.085 g (2) 0.850 g
(3) 8.500 g (4) 80.500 g
Q. The mass of glucose that should be dissolved in 50 g of water in order to produce the same lowering of vapour pressure as is produced by dissolving 1 g of urea in the same quantity of water is
1) 1 g 2) 3 g
3) 6 g 4) 18 g
Q.4. Molar heat of vaporisation of a liquid is 6 kJ . If the entropy change is 16 J , the boiling point of the liquid is .........
1) 375C
2) 375 K
3) 273 K
4) 102C
46. A solution of two liquids boils at a temperature more than the boiling point of either of them. Hence, the binary solution shows ..............
1) negative deviation from Raoult's law
2) positive deviation from Raoult's law
3) no deviation from Raoult's law
4) positive or negative deviation from Raoult's law depending upon the composition
Q.1. 25 of oxalic acid completely neutralised 0.064 g of sodium hydroxide. Molarity of the oxalic acid solution is
(1) 0.045
(2) 0.032
(3) 0.064
(4) 0.015
4. What concentration of nitrogen should be present in a glass of water at room temperature ? Assume a temperature of a total pressure of 1 atmosphere and mole fraction of nitrogen in air as 0.78 [KH nitrogen = M/mm Hg]