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Some Basic Concepts of Chemistry
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Concentration Terms
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How to convert 10 % Volume/Volume to ppb?
Important Questions on Some Basic Concepts of Chemistry
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Chemistry
>
Physical Chemistry
>
Some Basic Concepts of Chemistry
>
Concentration Terms
Calculate the concentration of the
2
%
(
w
/
w
)
NaCl
solution in terms of molality.
EASY
Chemistry
>
Physical Chemistry
>
Some Basic Concepts of Chemistry
>
Concentration Terms
What would be the molality of 20% (mass/mass) aqueous solution of
K
I
? (molar mass of
K
I
=
166
g
m
o
l
-
1
)
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Chemistry
>
Physical Chemistry
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Some Basic Concepts of Chemistry
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Concentration Terms
Dissolving
120
g
of urea in
1000
g
of water gave a solution of density
1
.
15
g
/
mL
.
The molarity of the solution is:
EASY
Chemistry
>
Physical Chemistry
>
Some Basic Concepts of Chemistry
>
Concentration Terms
While combusting in air,
4
g
of
H
2
gas was completely converted into water. If
36
μmole
of
CO
2
from air is dissolved into that water, what is the concentration of
CO
2
?
HARD
Chemistry
>
Physical Chemistry
>
Some Basic Concepts of Chemistry
>
Concentration Terms
What quantity (in
mL
) of a
45
%
acid solution of a mono-protic strong acid must be mixed with a
20
%
solution of the same acid to produce
800
mL
of a
29
.
875
%
acid solution?
EASY
Chemistry
>
Physical Chemistry
>
Some Basic Concepts of Chemistry
>
Concentration Terms
A litre of seawater (which weighs
1030
g
) contains
6
×
10
-
3
g
of dissolved oxygen. The concentration of dissolved oxygen in
ppm
is:
MEDIUM
Chemistry
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Physical Chemistry
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Some Basic Concepts of Chemistry
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Concentration Terms
The mole fraction of glucose
C
6
H
12
O
6
in an aqueous binary solution is
0
.
1
.
The mass percentage of water in it, to the nearest integer, is
…
…
…
EASY
Chemistry
>
Physical Chemistry
>
Some Basic Concepts of Chemistry
>
Concentration Terms
The number of water molecules in
250
m
L
of water is closest to [Given, density of water is
1
.
0
g
m
L
-
1
; Avogadro's number
=
6
.
023
×
10
23
EASY
Chemistry
>
Physical Chemistry
>
Some Basic Concepts of Chemistry
>
Concentration Terms
Which of the following is dependent on temperature?
MEDIUM
Chemistry
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Physical Chemistry
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Some Basic Concepts of Chemistry
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Concentration Terms
Dissolving 120 g of a compound of (mol. wt. 60) in 1000 g of water gave a solution of density 1.12 g/mL. The molarity of the solution is :
EASY
Chemistry
>
Physical Chemistry
>
Some Basic Concepts of Chemistry
>
Concentration Terms
What is the equivalent weight of methanol if one mole of
CH
3
OH
is combusted to form
CO
and
H
2
O
:
EASY
Chemistry
>
Physical Chemistry
>
Some Basic Concepts of Chemistry
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Concentration Terms
What is mole fraction of the solute in a
1
.
00
m aqueous solution?
MEDIUM
Chemistry
>
Physical Chemistry
>
Some Basic Concepts of Chemistry
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Concentration Terms
Molality
m
of
18
M
H
2
SO
4
is, approximately [
d
=
1
.
84
g
cm
-
3
, Molar mass of
H
2
SO
4
=
98
g
mol
-
1
].
MEDIUM
Chemistry
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Physical Chemistry
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Some Basic Concepts of Chemistry
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Concentration Terms
A gas mixture contains
25
%
He
and
75
%
CH
4
by volume at a given temperature and pressure. The percentage by mass of methane in the mixture is approximately ___ .
EASY
Chemistry
>
Physical Chemistry
>
Some Basic Concepts of Chemistry
>
Concentration Terms
The mole fraction of ethanol in water is
0
.
08
. Its molality is
MEDIUM
Chemistry
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Physical Chemistry
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Some Basic Concepts of Chemistry
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Concentration Terms
The
NaNO
3
weighed out to make
50
mL
of an aqueous solution containing
70
.
0
mg
Na
+
per
mL
is_
g
. (Rounded off to the nearest integer) [Given : Atomic weight in
gmol
-
1
-
Na
:
23
;
N
:
14
;
O
:
16
]
HARD
Chemistry
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Physical Chemistry
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Some Basic Concepts of Chemistry
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Concentration Terms
Strength of a
H
2
O
2
solution is labeled as
1
.
79
N
. Its strength can also be expressed as closest to
MEDIUM
Chemistry
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Physical Chemistry
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Some Basic Concepts of Chemistry
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Concentration Terms
The mole fraction of a solvent in aqueous solution of a solute is
0.8
.
The molality (in mol
k
g
-
1
) of the aqueous solution is:
MEDIUM
Chemistry
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Physical Chemistry
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Some Basic Concepts of Chemistry
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Concentration Terms
The molality of solution containing 15.20 g of urea, (molar mass = 60) dissolved in 150 g of water is
EASY
Chemistry
>
Physical Chemistry
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Some Basic Concepts of Chemistry
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Concentration Terms
8
g
of
NaOH
is dissolved in
18
g
of
H
2
O
. Mole fraction of
NaOH
in solution and molality (in
mol
kg
-
1
) of the solution respectively are:
