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Recent questions in Chemistry
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JEEMAIN and NEET
>>
Chemistry
Chemistry
Some Basic concepts in Chemistry
Atomic Structure
Classification of Elements and Periodicity in Properties
Chemical Bonding and Molecular Structure
Chemical Thermodynamics
Equilibrium
Redox Reactions
Hydrogen
s-Block Elements
p-Block Elements
P-Block elements (Group-13 and Group-14)
Hydrocarbons
Some Basic principles of Organic chemistry
Environmental Chemistry
States of Matter: Liquids and Gases
States of Matter: Solid State
Solutions
Electrochemistry
Surface Chemistry
General Principals and Processes of Isolation of Metals
p-Block elements (Group-15 to Group-18)
d-and-f-Block Elements
Co-ordination Compounds
Halogens
Oxygen: Alchohols, Phenols and Ethers
Nitrogen
Polymers
Biomolecules
Chemistry in everyday life
Practical Chemistry
Chemical Kinetics
Purification and Characterisation of Organic Compounds
Oxygen: Aldehydes, Ketones and Carboxylic Acids
Which of the following is not true about Phosphine?
jeemain
chemistry
class12
ch7
inorganic-chemistry
p-block-elements
group-15
phosphorus
medium
asked
Jul 14, 2014
by
balaji.thirumalai
1
answer
White phosphorus on reaction with
NaOH
gives
PH
3
as one of the products. What type of a reaction is this?
jeemain
chemistry
class12
ch7
inorganic-chemistry
p-block-elements
group-15
phosphorus
medium
asked
Jul 14, 2014
by
balaji.thirumalai
1
answer
Between
NH
3
and
PH
3
, which is a better electron donor and why?
jeemain
chemistry
class12
ch7
inorganic-chemistry
p-block-elements
group-15
nitrogen-and-phosphorus
nitrogen
phosphorus
easy
asked
Jul 14, 2014
by
balaji.thirumalai
1
answer
Choose the correct statement:
jeemain
chemistry
class12
ch7
inorganic-chemistry
p-block-elements
group-15
nitrogen-and-phosphorus
nitrogen
phosphorus
easy
asked
Jul 14, 2014
by
balaji.thirumalai
1
answer
Given the following Assertion and Reason, choose the correct answer:
jeemain
chemistry
class12
ch7
inorganic-chemistry
p-block-elements
group-15
nitrogen-and-phosphorus
nitrogen
phosphorus
medium
asked
Jul 14, 2014
by
balaji.thirumalai
1
answer
Which are the following statements are correct about White Phosphorus (
P
4
)?
jeemain
chemistry
class12
ch7
inorganic-chemistry
p-block-elements
group-15
phosphorus
easy
asked
Jul 14, 2014
by
balaji.thirumalai
1
answer
Why is it that in the case of nitrogen
NCl
3
is possible, but not
NCl
5
, while in the case of phosphorus,
PCl
3
and
PCl
5
are possible.
jeemain
chemistry
class12
ch7
inorganic-chemistry
p-block-elements
group-15
nitrogen-and-phosphorus
nitrogen
phosphorus
medium
asked
Jul 14, 2014
by
balaji.thirumalai
1
answer
Arrange the following compounds in order of reactivity towards
S
N
1
displacement.
1) 2 –Bromo-2-methylbutane
2) 1–Bromopentane
3) 2–Bromopentane
jeemain
chemistry
organic-chemistry
halogens
easy
asked
Apr 9, 2014
by
thanvigandhi_1
1
answer
For the reaction :
R
−
B
r
→
R
−
O
−
N
=
O
the suitable reagent is
jeemain
chemistry
organic-chemistry
halogens
easy
asked
Apr 9, 2014
by
thanvigandhi_1
1
answer
Alkyl halide reacts with an alcoholic solution of ammonia to give a mixture of :
jeemain
chemistry
organic-chemistry
halogens
easy
asked
Apr 9, 2014
by
thanvigandhi_1
1
answer
In
C
H
3
−
C
H
2
−
C
H
2
−
B
r
,
C
−
B
r
bond is formed by the overlapping of
jeemain
chemistry
organic-chemistry
halogens
easy
asked
Apr 9, 2014
by
thanvigandhi_1
1
answer
In the chlorination of isobutane, which product will be formed in excess
jeemain
chemistry
organic-chemistry
halogens
easy
asked
Apr 9, 2014
by
thanvigandhi_1
1
answer
C
H
3
B
r
K
C
N
→
A
+
4
H
→
C
H
3
C
H
2
N
H
2
I
U
P
A
C
name of
A
is
jeemain
chemistry
organic-chemistry
halogens
easy
asked
Apr 9, 2014
by
thanvigandhi_1
1
answer
Reduction of alkyl halide with nascent hydrogen leads to the formation of
jeemain
chemistry
organic-chemistry
halogens
easy
asked
Apr 9, 2014
by
thanvigandhi_1
3
answers
Sec butyl chloride will undergo alkaline hydrolysis in the polar solvent by
jeemain
chemistry
organic-chemistry
halogens
easy
asked
Apr 9, 2014
by
thanvigandhi_1
1
answer
The following method can not be considered suitable for the lab preparation of alkyl halide:
jeemain
chemistry
organic-chemistry
halogens
easy
asked
Apr 9, 2014
by
thanvigandhi_1
1
answer
A metal crystallises into two cubic phases , face-centered cubic (fcc) and body centered (bcc) whose unit lengths are
3.5
a
n
d
3.0
A
∘
respectively . Calculate the ratio of densities of fcc and bcc.
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
difficult
asked
Apr 9, 2014
by
sharmaaparna1
1
answer
Cu metal crystallises in face centered cubic lattice with cell edge , a = 361.6 pm . What is the density of Cu crystal ? (Atomic mass of copper = 63.5 amu ,
N
A
=
6.023
×
10
23
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
difficult
asked
Apr 9, 2014
by
sharmaaparna1
1
answer
The density of crystalline sodium chloride is
2.165
g
c
m
−
3
. What is the edge length of the unit cell.
sat
chemistry
liquids-solids-and-phase-change
jeemain
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
medium
asked
Apr 9, 2014
by
sharmaaparna1
1
answer
Silver crystallises in a face centered cubic unit cell . The density of Ag is
10.5
g
c
m
−
3
. Calculate the edge length of the unit cell .
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
medium
asked
Apr 8, 2014
by
sharmaaparna1
1
answer
What is the pressure of HCl gas at
−
40
∘
C
if its density is
8.0
k
g
m
−
3
?
(
R
=
8.314
J
K
−
1
m
o
l
−
1
)
sat
chemistry
liquids-solids-and-phase-change
states-of-matter
unit5
class11
difficult
ideal-gas-equation
q196
asked
Apr 8, 2014
by
sharmaaparna1
1
answer
A sample of gas occupies a volume of 512 mL at
20
∘
C
and 74 cm of Hg as pressure . What volume would this gas occupy at STP?
jeemain
chemistry
states-of-matter
unit5
class11
difficult
ideal-gas-equation
q195
asked
Apr 8, 2014
by
sharmaaparna1
1
answer
Helium and Argon are monoatomic gases and their atomic weights are 4 and 40 respectively . Under identical conditions, helium will diffuse through a semipermeable membrane
jeemain
chemistry
states-of-matter
unit5
class11
difficult
kinetic-molecular-theory-of-gases
q194
asked
Apr 8, 2014
by
sharmaaparna1
1
answer
2g of hydrogen diffuses from a container in 10 minutes . How many grams of oxygen would diffuse through the same container in the same time under similiar conditions ?
jeemain
chemistry
states-of-matter
unit5
class11
difficult
liquifaction-of-gases
q193
asked
Apr 8, 2014
by
sharmaaparna1
1
answer
The time taken for a certain volume of a gas X to diffuse through a small hole is 2 minutes . It takes 5.65 minutes for oxygen to diffuse under the similiar conditions . The molecular weight of X is
jeemain
chemistry
states-of-matter
unit5
class11
difficult
kinetic-molecular-theory-of-gases
q192
asked
Apr 8, 2014
by
sharmaaparna1
1
answer
If same moles of
O
2
diffuse in 18 sec and same mole of other gas diffuse in 45 sec then what is the molecular weight of the unknown gas?
jeemain
chemistry
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
difficult
q191
asked
Apr 8, 2014
by
sharmaaparna1
1
answer
pi bond is formed,
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
molecular-orbital-theory
easy
asked
Apr 7, 2014
by
meena.p
1
answer
The type of bonds present in
C
u
S
O
4
.5
H
2
O
are only
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
ionic-or-electrovalent-bond
easy
asked
Apr 7, 2014
by
meena.p
1
answer
An atom of one element A has four electrons in its outermost shell, and that of B has six electrons in the outermost shell. The formula of the compound formed by these two will be
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
kossel-lewis-approach-to-chemical-bonding
easy
asked
Apr 7, 2014
by
meena.p
1
answer
Among
C
a
H
2
,
N
H
3
,
N
a
H
and
B
2
H
6
which are covalent hydride ?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
kossel-lewis-approach-to-chemical-bonding
easy
asked
Apr 7, 2014
by
meena.p
1
answer
The density of a pure substance 'A' whose atoms pack in cubic close pack arrangement is 1g m/cc . If B atoms can occupy tetrahedral voids and all the tetrahedral voids are occupied by 'B' atoms what is the density of resulting solid in gm/cc . [Atomic mass (A) = 30 gm/mol and atomic mass (B) = 50gm/mol]
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
medium
asked
Apr 7, 2014
by
sharmaaparna1
1
answer
The root mean square of a gas at 300K is
3
√
R
. The molar mass of this gas in
K
g
m
o
l
−
1
is
jeemain
chemistry
states-of-matter
unit5
kinetic-molecular-theory-of-gases
class11
difficult
q189
asked
Apr 7, 2014
by
sharmaaparna1
1
answer
The
U
r
m
s
of
S
O
2
a
t
27
∘
C
jeemain
chemistry
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
difficult
q188
asked
Apr 7, 2014
by
sharmaaparna1
1
answer
The average kinetic energy of 1.6 g
C
H
4
molecules at
27
∘
C
is:
sat
chemistry
liquids-solids-and-phase-change
jeemain
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
difficult
q187
asked
Apr 7, 2014
by
sharmaaparna1
1
answer
The intermolecular forces vanishes among water molecules , then volume occupied by 1.8 g
H
2
O
(
l
)
at STP is
jeemain
chemistry
states-of-matter
intermolecular-forces-and-thermal-energy
unit5
class11
difficult
q186
asked
Apr 7, 2014
by
sharmaaparna1
1
answer
The intercept of plots of log V vs log T curves at constant pressure P for 1 mole gas will be
jeemain
chemistry
states-of-matter
ideal-gas-equation
unit5
class11
difficult
q185
asked
Apr 7, 2014
by
sharmaaparna1
1
answer
For one mole of an ideal gas
(
δ
P
δ
T
)
V
.
(
δ
V
δ
T
)
P
.
(
δ
V
δ
T
)
T
is equal to ....
jeemain
chemistry
states-of-matter
ideal-gas-equation
unit5
class11
difficult
q184
asked
Apr 7, 2014
by
sharmaaparna1
1
answer
The kinetic molecular theory attributes an average translational kinetic energy of
3
2
R
T
N
to each particle. What rms speed woul a mist particle of mass
10
−
12
g
have a root temperature
(
27
∘
C
)
according to kinetic theory of gases.
jeemain
chemistry
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
difficult
q183
asked
Apr 7, 2014
by
sharmaaparna1
1
answer
The composition of the equilibrium mixture
(
C
l
2
⟺
2
C
l
)
which is attained at
1200
∘
C
is determined by measuring the rate of effusion through a pinhole . It is observed that at 1.80 mm Hg pressure , the mixture effuses 1.16 times as fast as krypton effuses under the same conditions. Calculate the fraction of chlorine molecules dissociated anto atoms.(Atomic wt of Kr = 84)
jeemain
chemistry
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
difficult
q182
asked
Apr 5, 2014
by
sharmaaparna1
1
answer
Pure
O
2
diffuses through an aperture in 224 seconds whereas mixture of
O
2
and another gas containing
80
%
O
2
diffuses from the same in 234 sec. What is mol. wt. of gas?
jeemain
chemistry
states-of-matter
liquifaction-of-gases
unit5
class11
difficult
q181
asked
Apr 5, 2014
by
sharmaaparna1
1
answer
The average speed at
T
1
K
and the most probable speed at
T
2
K
o
f
CO_2
g
a
s
i
s
9\times10^4cm/s. Calculate the value of
T
1
a
n
d
T
2
jeemain
chemistry
states-of-matter
unit5
class11
kinetic-molecular-theory-of-gases
difficult
q180
asked
Apr 5, 2014
by
sharmaaparna1
1
answer
The density of a mixture of
O
2
and
N
2
at NTP is 1.3g/l . Calculate partial pressure of
O
2
.
jeemain
chemistry
states-of-matter
unit5
class11
ideal-gas-equation
difficult
q179
asked
Apr 5, 2014
by
sharmaaparna1
1
answer
Which of the following correctly denotes the catalyst and promoter used in Haber's process for manufacture of ammonia, respectively?
jeemain
chemistry
surface-chemistry
ch5
sec-a
medium
asked
Apr 4, 2014
by
mosymeow_1
1
answer
Which of the following properties are of lyophilic colloids?
jeemain
chemistry
surface-chemistry
medium
asked
Apr 4, 2014
by
mosymeow_1
1
answer
Micelles are what type of colloids?
jeemain
chemistry
surface-chemistry
medium
asked
Apr 4, 2014
by
mosymeow_1
1
answer
Which type of colloids mentioned below has both lyophilic and lyophobic groups of molecules?
jeemain
chemistry
surface-chemistry
sec-a
asked
Apr 4, 2014
by
mosymeow_1
2
answers
Which of the following are not the properties of colloidal solution?
jeemain
chemistry
surface-chemistry
medium
asked
Apr 4, 2014
by
mosymeow_1
1
answer
Among the following which has the most polar character.
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)theory
easy
asked
Apr 4, 2014
by
meena.p
1
answer
A section of the periodic table is given below elements A , B and X, Y in two groups. Which of the bonds given below is the least polar.
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)theory
medium
asked
Apr 4, 2014
by
meena.p
1
answer
p- bonding occurs in each of the following except
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
molecular-orbital-theory
easy
asked
Apr 4, 2014
by
meena.p
1
answer
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