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Recent questions and answers in Some Basic concepts in Chemistry
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JEEMAIN and NEET
>>
Chemistry
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Some Basic concepts in Chemistry
For the reaction :
A
+
2
B
→
C
,5 mole of A and 8 mole of B will produce
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q40
easy
answered
Nov 15, 2019
by
rekhubetu
2
answers
An organic compound containing C and it has 92.3% carbon .Its empirical formula is :
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
percentage-composition
q30
medium
answered
Jul 28, 2018
by
sunita0606berwal
2
answers
Insulin contains 3.4% sulphur.Then the minimum molecular mass of the insulin is about
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
atomic-and-molecular-masses
q3
medium
answered
Feb 1, 2018
by
meenapooja656
2
answers
How many EDTA (ethylene diamine tetracetic acid)molecules are required to make an octahedral complex with a
C
a
2
+
ion ?
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q16
easy
answered
Oct 29, 2016
by
saleraman
2
answers
Moles of sodium thiosulphate reacted and unreacted after the reaction are respecticvely
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
Jan 18, 2016
by
meena.p
1
answer
An element X (atomic wt. =125) crystallises is simple cubic structure. If diameter of the largest atom which can be placed without disturbing unit cell is
366
p
m
. Find the density of pure element X in
g
m
/
c
m
3
[Given ,
N
A
=
6
×
10
23
]
jeemain
chemistry
some-basic-concepts-in-chemistry
answered
Jan 18, 2016
by
meena.p
1
answer
If a solution contains 1 mol of
K
M
n
O
4
in acidic medium, it will oxidize :
jeemain
chemistry
some-basic-concepts-in-chemistry
answered
Jan 18, 2016
by
meena.p
1
answer
The molar ratio of
F
e
2
+
t
o
F
e
3
+
i
n
a
m
i
x
t
u
r
e
o
f
F
e
S
O
4
and
F
e
2
(
S
O
4
)
3
having equal number of sulphate ion in both ferrous and ferric sulphate is :
jeemain
chemistry
some-basic-concepts-in-chemistry
answered
Jan 18, 2016
by
meena.p
1
answer
A mixture of
N
H
4
N
O
3
and
(
N
H
4
)
2
H
P
O
4
contain
30.4
%
mass percent of nitrogen. What is the mass ratio of the two components in the mixture.
jeemain
chemistry
some-basic-concepts-in-chemistry
answered
Jan 18, 2016
by
meena.p
1
answer
how many gram of NaOH will be needed to prepare 250 ml 0.1M solution?
answered
Aug 6, 2015
by
sharmaaparna1
1
answer
the ratio of atoms and molecules of sulphur present in 57.6g of Sg is
asked
Aug 5, 2015
by
manim31899
0
answers
main function of roasting
answered
Dec 13, 2014
by
vijayalakshmi.r
2
answers
examples for ore of aluminium
answered
Dec 12, 2014
by
rajesh1158_1
2
answers
0.5
g
of fluming
H
2
S
O
4
(oleum) is diluted with water. This solution is completely neutralised by
26.7
m
L
of
0.4
N
N
a
O
H
. The percentage of free
S
O
3
in the sample is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
difficult
answered
Apr 1, 2014
by
meena.p
1
answer
0.005
c
m
thick coating of silver is deposited on a plate of
0.5
m
2
area. The number of silver atoms deposited on the plate are (atomic mass of silver
=
108
, and its density
=
7.9
g
c
m
−
3
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
answered
Apr 1, 2014
by
meena.p
1
answer
Four one litre flasks are separately filled with the gases hydrogen, helium , oxygen and ozone at the same room temperature and pressure. The ratio of total number of atoms of these gases present in the different flasks would be
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
Apr 1, 2014
by
meena.p
1
answer
The density of salt solution is
1.13
g
c
m
−
3
at
298
k
. The solution contains
17.0
%
sodium chloride . What volume of solution will contain
38.42
g
of
N
a
C
l
?
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
percentage-composition
difficult
answered
Apr 1, 2014
by
meena.p
1
answer
Haemoglobin contains
0.33
%
of irons by weight. The molecular weight of haemoglobion is approximately
67200
. The number of iron atoms (at wt of
F
e
=
56
) present in one molecule of haemolgobin is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
percentage-composition
medium
answered
Apr 1, 2014
by
meena.p
1
answer
A hydrocarbon contains
85.7
%
C
If
42
m
g
of the compound contains
3.01
×
10
20
molecules, the molecular formula of the compound is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
answered
Apr 1, 2014
by
meena.p
1
answer
How many g of KCl would have to be dissolved in
60
g
H
2
O
to give
20
%
by weight of solution ?
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
medium
answered
Apr 1, 2014
by
meena.p
1
answer
1.12
m
L
of a gas is produced at STP by the action of
4.12
m
g
of alcohol ROH with methyl magnesium iodide. The molecular mass of alcohol is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
difficult
answered
Apr 1, 2014
by
meena.p
1
answer
Which of the following has the largest number of atoms?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
Mar 31, 2014
by
meena.p
1
answer
Substance is found to contain
7
%
nitrogen, The minimum molecular weight of it is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
percentage-composition
medium
answered
Mar 31, 2014
by
meena.p
1
answer
Two samples of lead oxide were separately reduced to metallic lead by heating in a current of hydrogen. The weight of lead from one oxide was half the weight of lead obtained from the other oxide. The data illustrates
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
laws-of-chemical-combinations
easy
answered
Mar 31, 2014
by
meena.p
1
answer
The mass of a piece of paper is
0.02
g
and the mass of a solid substance along with the same piece of paper is
20.036
g
. If the volume of the solid is
2.16
c
m
3
its density to the proper number of significant digits will be
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
laws-of-chemical-combinations
easy
answered
Mar 31, 2014
by
meena.p
1
answer
Two Containers P and Q of equal volume (1 litre each) contain 6g of
O
2
and
S
O
2
respectively at
300
k
and 1 atmosphere then,
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
answered
Mar 31, 2014
by
meena.p
1
answer
When a sample of human blood is diluted
200
times its initial volume and microscopically examined in a layer
0.10
m
m
thick , an average of
30
R
B
C
are found in
100
×
100
micrometer square. The number of RBC in
1
m
m
3
of undiluted blood is
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
jeemain
physical-chemistry
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
difficult
answered
Mar 31, 2014
by
meena.p
1
answer
What quantity of limestone
(
C
a
C
O
3
)
on heating will give
56
k
g
of
C
a
O
?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
answered
Mar 31, 2014
by
meena.p
1
answer
The Loschmidt number is the number of
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
answered
Mar 31, 2014
by
meena.p
1
answer
If
N
A
is Avogadro's number then number of valence electrons in
4.2
g
of nitride ions
(
N
3
−
)
is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
difficult
answered
Mar 31, 2014
by
meena.p
1
answer
Among
F
e
S
O
4
.7
H
2
O
(
A
)
,
C
u
S
O
4
.5
H
2
O
(
B
)
,
Z
n
S
O
4
.7
H
2
0
(
c
)
,
M
n
S
O
4
.4
H
2
O
(D), isomorphous salts are
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
laws-of-chemical-combinations
easy
answered
Mar 28, 2014
by
meena.p
1
answer
The atomic weights of two elements A and B are 40 and 80 respectively . If xg of A contains y atoms, how many atoms are present in
2
x
g
r
a
m
of B?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
easy
answered
Mar 28, 2014
by
meena.p
1
answer
Which of the following is isomorphous with magnesium sulphate
(
M
g
S
O
4
.
7
H
2
O
)
?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
atomic-and-molecular-masses
medium
answered
Mar 28, 2014
by
meena.p
1
answer
The charge on 1 gram ion of
A
l
3
+
is :
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
answered
Mar 28, 2014
by
meena.p
1
answer
The unit
J
P
a
−
1
is equivalent to
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
properties-of-matter-and-their-measurement
easy
answered
Mar 28, 2014
by
meena.p
1
answer
A balanced chemical equation is in accordance with
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
laws-of-chemical-combinations
easy
answered
Mar 28, 2014
by
meena.p
1
answer
Which of the following has three significant figures ?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
medium
answered
Mar 28, 2014
by
meena.p
1
answer
Find the equivalent weight of
H
3
P
O
4
in the reaction.
C
a
(
O
H
)
2
+
H
3
P
O
4
→
C
a
H
P
O
4
+
2
H
2
O
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
medium
answered
Mar 28, 2014
by
meena.p
1
answer
How many milliliters of
0.5
M
H
2
S
O
4
are needed to dissolve
0.5
g
of copper (II) carbonate ?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
difficult
answered
Mar 28, 2014
by
meena.p
1
answer
A plant virus is found to consists of uniform cylindrical particles of
150
A
∘
in diameter and
5000
A
∘
long. The specific volume of the virus is
0.75
c
m
3
/
g
If the virus is considered to be a single particle , find its molar mass.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
difficult
answered
Mar 28, 2014
by
meena.p
1
answer
Calculate the molarity of water if its density is
1000
k
g
/
m
3
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
easy
answered
Mar 28, 2014
by
meena.p
1
answer
Calculate the molality of 1 litre solution of
93
(weight / volume). the density of the solution is
1.84
g
/
m
l
.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
difficult
answered
Mar 28, 2014
by
meena.p
1
answer
2.68
×
10
−
3
moles of a solution containing an ion
A
n
+
acqired.
1.81
×
10
−
3
moles of
M
n
O
−
4
for the oxidation of
A
n
+
+
0
A
O
−
3
in acid medium. What is the value of n
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
difficult
answered
Mar 28, 2014
by
meena.p
1
answer
Statement 1: In the titration of
N
a
2
C
O
3
with
H
c
l
using methyl orange indicator, the volume required at the equivalence point is twice that of the acid required using phenolphthalein indicator Statement 2: Two moles of
H
C
l
are required for the complete neutralization of one mole of
N
a
2
C
O
3
.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
medium
answered
Mar 27, 2014
by
meena.p
1
answer
Mixture
X
containing
0.02
m
o
l
of
[
C
O
(
N
H
3
)
5
S
O
4
]
B
r
and
0.02
m
o
l
of
[
C
O
(
N
H
3
)
B
r
]
S
O
4
was prepared in
2
litre of solution .
1
litre of mixture X+ excess
A
g
N
O
3
→
Y
1
litre of mixture
X
+
excess
B
a
C
l
2
→
Z
. Number of moles of
Y
and
Z
are
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
difficult
answered
Mar 27, 2014
by
meena.p
1
answer
A metallic oxide contains 60% of the metal.The equivalent weight of the metal is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
easy
answered
Mar 26, 2014
by
sreemathi.v
1
answer
The composition of a sample of Wustite is
F
e
0..93
O
1.00
.What percentage of the iron is present in the form of
F
e
(
I
I
I
)
?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
percentage-composition
difficult
answered
Mar 26, 2014
by
sreemathi.v
1
answer
Zinc sulphate contains 22.65% of zinc and 43.9% of water of crystallization. If the law of constant proportions is true, then the weight of zinc required to produce 20g of the crystals will be
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
percentage-composition
easy
answered
Mar 26, 2014
by
sreemathi.v
1
answer
The specific heat of a metal is 0.16, its approximate atomic weight would be
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
laws-of-chemical-combinations
easy
answered
Mar 26, 2014
by
sreemathi.v
1
answer
The numerical value of N/n (where N is the number of molecules in a given sample of gas and n is the number of moles of the gas) is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
easy
asked
Mar 26, 2014
by
sreemathi.v
1
answer
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