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Chemistry
List of top Chemistry Questions
A Grignard reagent may be made by reacting magnesium with
Chemistry
Haloalkanes and Haloarenes
A gaseous mixture of three gases A. B and C has a pressure of 10 atm. The total number of moles of all the gases is 10. If the partial pressures of Aand B are 3.0 and 1.0 atm respectively and if C has a mol/wt. of 2.0. What is the weight of C in g present in the mixture ?
Chemistry
States of matter
A gaseous mixture contains oxygen and nitrogen in the ratio of 1 : 4 by weight therefore the ratio of their number of molecules is
Chemistry
States of matter
A gas
(
X
)
(X)
(
X
)
is obtained when copper reacts with dilute
H
N
O
3
HNO_3
H
N
O
3
. The gas thus formed reacts with oxygen to give brown fumes of
(
Y
)
(Y)
(
Y
)
.
(
Y
)
(Y)
(
Y
)
when dissolved in water gives an important acid
(
Z
)
(Z)
(
Z
)
and the gas
(
X
)
(X)
(
X
)
.
X
X
X
,
Y
Y
Y
and
Z
Z
Z
respectively are
Chemistry
p -Block Elements
A gas X diffuses three times faster than another gas Y, the ratio of their densities i.e.,
D
x
:
D
y
D_x : D_y
D
x
:
D
y
is
Chemistry
States of matter
A galvanic cell is set up from a zinc bar weighing 100 g and 1.0 litre of 1.0 M Cu
S
O
4
SO_4
S
O
4
solution. How long would the cell run if it is assumed to deliver a steady current of 1.0 ampere ? (Atomic mass of Zn = 65)
Chemistry
Electrochemistry
A furanose ring consists of a skeleton of
Chemistry
Biomolecules
A flask containing air (open to the atmosphere) is heated from 300 K to 500 K. The percentage of air escaped to the atmosphere is
Chemistry
States of matter
A dispersion of AgCl in water is
Chemistry
Surface Chemistry
A diode used as a rectifier is
Chemistry
The solid state
A current of 9.65 ampere flowing for 10 minutes deposits 3.0 g of the metal which is monovalent. The atomic mass of the metal is
Chemistry
Electrochemistry
Bakelite is obtained from phenol by reacting with
Chemistry
Polymers
Which of the following is not a condensation polymer ?
Chemistry
Polymers
A compound is formed by two elements
Y
Y
Y
and
Z
Z
Z
. The element
Z
Z
Z
forms
c
c
p
ccp
cc
p
and atoms
Y
Y
Y
occupy
1
/
3
r
d
1/3\, rd
1/3
r
d
of tetrahedral voids. The formula of the compound is
Chemistry
The solid state
A compound 'A' having the molecular formula
C
5
H
12
O
C_5H_{12}O
C
5
H
12
O
on oxidation gives a compound 'B' with molecular formula
C
5
H
10
O
C_5H_{10}O
C
5
H
10
O
. Compound 'B' gave a 2, 4-DNP derivative but did not give the haloform test. The structure of the compound A is
Chemistry
Alcohols, Phenols and Ethers
A compound
(
A
)
(A)
(
A
)
of molecular formula
C
7
H
8
O
C_7H_8O
C
7
H
8
O
is insoluble in water and dilute sodium bicarbonate but dissolves in dilute aqueous sodium hydroxide and gives a characteristic colour with aqueous
F
e
C
l
3
FeCl_3
F
e
C
l
3
. On treatment with bromine water, it readily gives a precipitate of
C
7
H
5
O
B
r
3
C_7H_5OBr_3
C
7
H
5
OB
r
3
. Write down the structure of the compound
(
A
)
(A)
(
A
)
.
Chemistry
Alcohols, Phenols and Ethers
A compound is formed by two elements X and Y. Atoms of the element Y (as anions) make ccp and those of the element X (as cations) occupy all the octahedral voids. What is the formula of the compound?
Chemistry
The solid state
A compound
′
A
′
'A'
′
A
′
having the molecular formula
C
+
5
H
12
O
C+{5}H_{12}O
C
+
5
H
12
O
, on oxidation gives a compound
′
B
′
'B'
′
B
′
with molecular formula
C
5
H
10
O
C_{5}H_{10}O
C
5
H
10
O
. Compound
′
B
′
'B'
′
B
′
gave a
2
,
4
−
2,4-
2
,
4
−
dinitrophenylhydrazine derivative but did not answer haloform test or silver mirror test. The structure of compound
′
A
′
'A'
′
A
′
is
Chemistry
Aldehydes, Ketones and Carboxylic Acids
If the melting point of ice is
0
?
C
0^?C
0
?
C
and latent heat of fusion is
5.46
k
J
m
o
l
−
1
5.46\, kJ\, mol^{-1}
5.46
k
J
m
o
l
−
1
, the entropy change for the conversion of
18
g
18\, g
18
g
of ice to water at one atmosphere is
Chemistry
Thermodynamics terms
A complex involving
d
s
p
2
dsp^2
d
s
p
2
hybridisation has
Chemistry
coordination compounds
A combustible gas is liberated when caustic soda solution is heated with
Chemistry
GROUP 1 ELEMENTS
A colloid always :
Chemistry
Surface Chemistry
A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified as_____________ .
Chemistry
Surface Chemistry
A chemical
′
A
?
'A?
′
A
?
is used for the preparation of washing soda to recover ammonia. When
C
O
2
CO_2
C
O
2
is bubbled through an aqueous solution of
′
A
?
'A?
′
A
?
, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of
′
A
′
'A'
′
A
′
?
Chemistry
GROUP 1 ELEMENTS
A chelating agent has two or more than two donor atoms to bind to a single metal ion. Which of the following is not a chelating agent?
Chemistry
coordination compounds
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