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Chemistry
List of top Chemistry Questions
The pK
b
of dimethylamine and pK
a
of acetic acid are 3.27 and 4.77 respectively at T (K). The correct option for the pH of dimethylammonium acetate solution is
Chemistry
Equilibrium
At constant temperature 200
$cm^3$
of
$N_2$
at 720 mm and 400
$cm^3$
of 02 at 750 mm pressure are put together in a one litre flask. The final pressureof mixture is
Chemistry
States of matter
At 300 K, 36 g of glucose present per litre in its solution has an osmotic pressure of 4.98 bar. If the osmotic pressure of a urea solution is 1.52 bar its at the same temperature, concentration is
Chemistry
Solutions
Aniline is prepared in presence of
$Fe/HCl$
from
Chemistry
Preparation of Amines
1
$^\circ$
Alkyl isocyanide on reduction with Zn-Hg/ HCI give
Chemistry
Amines
2 L of
$SO_2$
gas at 760 mm Hg are transferred to 10 L flask containing oxygen at a particular temperature, the partial pressure of
$SO_2$
in the flask is
Chemistry
States of matter
32.5 g of zinc (At. mass 65) will completely react with dilute sulphuric acid to give
Chemistry
Some basic concepts of chemistry
An acidic solution of
$Cu^{2+}$
containing
$0.4\, g$
of
$Cu^{2+}$
ions is electrolysed until all the copper is deposited. What is the volume of oxygen evolved at
$NTP$
?
Chemistry
Electrochemistry
An electrochemical cell can behave like an electrolytic cell when ________ .
Chemistry
Electrochemistry
According to Bronsted-Lowry concept of acids and bases a conjugate acid-base pair can exist as
Mark the option in which conjugate pair is not correctly matched.
Species Conjugate acid Conjugate base
Chemistry
Equilibrium
In the reaction:
B
C
l
3
+
P
H
3
⇌
C
l
3
B
·
P
H
3
Lewis base is:
JEE Main
Chemistry
Stoichiometry and Stoichiometric Calculations
A substance will be deliquescent if its vapour pressure
Chemistry
Solutions
Which one of the following is an addition polymer?
Chemistry
classification of polymers
The energy of an electron in the
$3\,S$
orbital (excited state) of
$H$
- atom is
KEAM
Chemistry
Structure of atom
The coordination number and oxidation state of ( in
$K_3[Cr(C_2O_4)_3]$
are respectively
Chemistry
Oxidation Number
Which of the following is the correct unit of angular momentum of an lectron in an orbital of an atom?
KEAM
Chemistry
Structure of atom
At anode in the electrolysis of fused sodium chloride
Chemistry
Electrochemistry
Choose the correct statement from the following which is related to electrochemical series
Chemistry
Electrochemistry
Which one of the following is correct decreasing order of acidity?
Chemistry
Alcohols, Phenols and Ethers
In a Galvanic cell
Chemistry
Electrochemistry
$23\, g$
of ethanol
$(C_2H_5OH)$
on reaction with ethanoic acid
$(CH_3COOH)$
forms
$44\, g$
of ethyl ethanoate
$(CH_3COOC_2H_5)$
and some weight of water. The percentage yield of the reaction is
Chemistry
Some basic concepts of chemistry
Among the following, which species represents a pseudohalide?
KEAM
Chemistry
Group 17 Elements
$ A(g)+3B(g)4C(g) $
Initially concentration of
$ A $
is equal to that of
$ B $
. The equilibrium concentrations of
$ A $
and
$ C $
are equal.
$ {{K}_{c}} $
is:
KEAM
Chemistry
Equilibrium
The basicity of pyrophosphorous acid is
KEAM
Chemistry
Phosphorus
An alkene
$ {{C}_{4}}{{H}_{8}} $
, was treated with ozone and then with zinc and water to give acetone and formaldehyde. The alkene is:
KEAM
Chemistry
Alkenes
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