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Chemistry
List of top Chemistry Questions
Nucleic acids are polymers of
J & K CET - 2013
J & K CET
Chemistry
Nucleic Acids
Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at
$25^\circ $
C. For this process, the correct statement is
JEE Advanced - 2013
JEE Advanced
Chemistry
Adsorption
$K_2Cr_2O_7$
in acidic medium converts into
AIIMS - 2013
AIIMS
Chemistry
d -and f -Block Elements
In the preparation of
$ HNO_{3}$
we get
$NO$
gas by catalytic oxidaton of ammonia. The moles of
$NO$
produced by the oxidation of two moles of
$NH_{3}$
will be
AIIMS - 2013
AIIMS
Chemistry
Ammonia
In
$BF_3$
, the
$B??F$
bond length is
$1.30\, ??
, when
$BF_3$
is allowed to be treated with
$Me_3N$
, it forms an adduct,
$Me_3N \to BF_3$
, the bond length of
$B ??F$
in the adduct is
AIIMS - 2013
AIIMS
Chemistry
Chemical bonding and molecular structure
In a solid, atom
$M$
occupies
$ccp$
lattice and
$1/3^{rd}$
of tetrahedral voids are occupied by atom
$N$
. Find the formula of solid formed by
$M$
and
$N$
.
AIIMS - 2013
AIIMS
Chemistry
The solid state
If volume of
$2$
moles of an ideal gas at
$540 \,K$
is
$44.8$
litre, then its pressure will be
UP CPMT - 2013
UP CPMT
Chemistry
States of matter
Hybridisation and structure of
$XeF_2$
is
UP CPMT - 2013
UP CPMT
Chemistry
Chemical bonding and molecular structure
How many sigma bonds are there in
$P_4O_{10}$
?
UP CPMT - 2013
UP CPMT
Chemistry
p -Block Elements
$ { ->[{(HI (excess)}][{\Delta}] }$
AIIMS - 2013
AIIMS
Chemistry
Alcohols, Phenols and Ethers
Hair cream is
AIIMS - 2013
AIIMS
Chemistry
Surface Chemistry
Electrode potential of hydrogen electrode is
$18\, mV,$
then
$[H^+]$
is
AIIMS - 2013
AIIMS
Chemistry
Electrochemistry
The one which is least basic is
UP CPMT - 2013
UP CPMT
Chemistry
introduction to organic chemistry
"No two electrons in an atom will have all the four quantum numbers same". The statement is known as
UP CPMT - 2013
UP CPMT
Chemistry
Structure of atom
Blue colour of the sky is due to
UP CPMT - 2013
UP CPMT
Chemistry
Surface Chemistry
The highest oxidation state of
$ Os$
is
$+ 8$
. Osmium is a
$5$
$d$
-block element.
AIIMS - 2013
AIIMS
Chemistry
d block elements
Phenol forms
$2,4, 6$
-tribromophenol on treatment with
$Br_{2}$
in carbon disulphide at
$273 \,K$
. Bromine polarises in carbon disulphide.
AIIMS - 2013
AIIMS
Chemistry
Chemical Reactions
On adding zinc pieces to aqueous
$FeCl_{3}$
solution, colour changes from deep yellow to light green. Aqueous
$FeCl_{3}$
is acidic and on adding
$Zn$
, nascent hydrogen is produced which reduces deep yellow
$FeCl_{3}$
solution to light green
$FeCl_{2}$
solution.
AIIMS - 2013
AIIMS
Chemistry
Classical Idea Of Redox Reactions – Oxidation And Reduction Reactions
Number of radial and angular nodes for
$3p$
-orbital are 1, 1 respectively. Number of radial and angular nodes depends only on principal quantum number.
AIIMS - 2013
AIIMS
Chemistry
Structure of atom
Formic acid reduces Tollen?? reagent. Compounds containing
$??HO$
group reduce Tollen?? reagent.
AIIMS - 2013
AIIMS
Chemistry
Chemical Reactions
Cu is stronger reducing agent than
$H_2$
. E
$^{\circ}$
of
$Cu^{2+}/Cu$
is negative.
AIIMS - 2013
AIIMS
Chemistry
Redox reactions
Bond dissociation energy is
$F_2 > Cl_2$
.
$Cl_2$
has more electronic repulsion than
$F_2$
.
AIIMS - 2013
AIIMS
Chemistry
p -Block Elements
Which of the following is not an ore of iron?
UP CPMT - 2013
UP CPMT
Chemistry
General Principles and Processes of Isolation of Elements
Arrange the following compounds in increasing order of reactivity towards nucleophilic addition reaction. (I)
$C_6H_5COCH_3$
(II)
$CH_3 CO-C_2H_5$
(III)
$C_6H_5CHO$
(IV)
$Cl-CH_2 - CHO$
AIIMS - 2013
AIIMS
Chemistry
Aldehydes, Ketones and Carboxylic Acids
Electron affinity is positive, when
AIIMS - 2013
AIIMS
Chemistry
Chemical Reactions
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