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Chemistry
List of top Chemistry Questions
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
A certain current liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphate solution ?
Chemistry
Electrochemistry
A certain compound
X
X
X
imparts a golden yellow flame. When zinc powder is heated with concentrated solution of
X
X
X
,
H
2
H_2
H
2
gas is evolved.
X
X
X
combines with
C
O
2
CO_2
C
O
2
to give a salt
Y
Y
Y
.
Y
Y
Y
is a hydrated salt which on reaction with
H
C
l
HCl
H
Cl
or excess of
C
O
2
CO_2
C
O
2
gives another salt
Z
Z
Z
which is an important part of baking powder. Identify
X
X
X
,
Y
Y
Y
and
Z
Z
Z
.
Chemistry
GROUP 1 ELEMENTS
A certain compound has a formula
C
3
H
6
O
{C_3H_6O}
C
3
H
6
O
. It combines with hydroxylamine to form two compounds which are geometrical isomers of each other. It is
Chemistry
Aldehydes, Ketones and Carboxylic Acids
A box of T L-capacity ls'divided into two equal compartments by a thin partition which are filled with 2 g
H
2
H_2
H
2
and 16 g
C
H
4
CH_4
C
H
4
respectively. The pressure in compartment filled with
H
2
H_2
H
2
is recorded as P atm. The total pressure when partition is removed will be
Chemistry
States of matter
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