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Chemistry
List of top Chemistry Questions
Polymer of sucrose is
MGIMS Wardha - 2011
MGIMS Wardha
Chemistry
Polymers of Commercial Importance
Number of isomeric forms (constitutional and stereoisomers) for
$ [Rh(en)_{2}(NO_{2})\,(SCN)^{+} $
are
Delhi UMET/DPMT - 2011
Delhi UMET/DPMT
Chemistry
Isomerism in Coordination Compounds
Milk is an example of
COMEDK - 2011
COMEDK
Chemistry
Emulsions
Maltose gives rise to two molecules of
Delhi UMET/DPMT - 2011
Delhi UMET/DPMT
Chemistry
Carbohydrates
Iodine oxidises sodium borohydride to give
AIIMS - 2011
AIIMS
Chemistry
p -Block Elements
In the van der Waals equation, 'a' signifies
AIIMS - 2011
AIIMS
Chemistry
States of matter
If the bond dissociation energies of
$X Y, X_{2}$
and
$Y_{2}$
(all diatomic molecules) are in the ratio of
$1: 1: 0.5$
and
$\Delta H_{f}$
for the formation of
$X Y$
is
$-200\, kJ \,mol ^{-1}$
. The bond dissociation energy of
$X_{2}$
will be
AIIMS - 2011
AIIMS
Chemistry
Nuclear physics
Identify the reagents
$(X, Y, Z)$
used in the conversion of
$3$
-methylaniline to
$3$
-nitrotoluene.
Delhi UMET/DPMT - 2011
Delhi UMET/DPMT
Chemistry
Chemical Reactions
Find the hydrolysis product of maltose.
AIIMS - 2011
AIIMS
Chemistry
Biomolecules
Copper crystallises in a face centred cubic lattice with a unit cell length of
$361\, pm$
. What is the radius of copper atom in
$pm$
?
AIEEE - 2011
AIEEE
Chemistry
The solid state
Consider the following reaction:
$C_2H_5OH + H_2SO_4 \to$
Product Among the following, which one cannot be formed as a product under any conditions?
AIEEE - 2011
AIEEE
Chemistry
Alcohols, Phenols and Ethers
Boron cannot form which one of the following anions?
AIEEE - 2011
AIEEE
Chemistry
Group 13 Elements
Phenoxide ion on treatment with active alkyl halide (e.g.,
$CH _{2}= CH - CH _{2} Cl$
) gives two products viz.
$O$
-substituted and
$C$
-substituted. Phenoxide ion is an ambident nucleophile.
AIIMS - 2011
AIIMS
Chemistry
reaction mechanism
:
$pH $
of neutral solution is always
$7$
. :
$pH$
of a solution does not depend upon temperature.
AIIMS - 2011
AIIMS
Chemistry
Acids and Bases
:
$p$
-dichlorobenzene is less soluble in organic solvents than the corresponding
$o$
-isomer. :
$o$
-dichlorobenzene is polar while
$p$
-dichlorobenzene is not
AIIMS - 2011
AIIMS
Chemistry
Properties of benzene
$ NaCl $
is less soluble in heavy water than in ordinary water. Dielectric constant of ordinary water is more than that of heavy water.
AIIMS - 2011
AIIMS
Chemistry
heavy water
Helium is used in diving apparatus. Solubility of helium is less in blood.
AIIMS - 2011
AIIMS
Chemistry
p -Block Elements
$H_2S$
is less acidic than
$H_2$
Te Te has larger radius than S.
AIIMS - 2011
AIIMS
Chemistry
p -Block Elements
Fructose is a reducing sugar. It has a ketonic group.
AIIMS - 2011
AIIMS
Chemistry
Biomolecules
: As a lead storage battery gets discharged, density of electrolyte, present in it, decreases. : Lead and lead dioxide both react with sulphuric acid to form lead sulphate.
AIIMS - 2011
AIIMS
Chemistry
Galvanic Cells
An organic compound
$'X'$
on treatment with pyridinium chlorochromate in dichloromethane gives compound
$'Y'$
Compound
$'Y'$
reacts with
$I_{2}$
and alkali to form triiodomethane. The compound
$'X'$
is
AIIMS - 2011
AIIMS
Chemistry
Chemical Reactions
$CH _{3} COOH \xrightarrow{ LiAlH _{4}}A + CH _{3} COOH \xrightarrow{ H _{3} O ^{+}} B + H _{2} O$
In the above reactions '
$A$
' and '
$B$
' respectively are
AIIMS - 2011
AIIMS
Chemistry
Chemical Reactions
The following are some statements related to
$VA $
group hydrides, I. Reducing property increases from
$NH_{3}$
to
$BiH_{3}$
II. Tendency to donate lone pair decreases from
$NH_{3}$
to
$BiH_{3}$
III. Thermal stability of hydrides decreases from
$NH_{3}$
to
$BiH_{3}$
IV. Bond angle of hydrides decreases from
$NH_{3}$
to
$BiH_{3}$
The correct statements are
AIIMS - 2011
AIIMS
Chemistry
Group 15 Elements
Which one of the following noble gases is used in miners cap lamps?
AIIMS - 2011
AIIMS
Chemistry
Group 18 Elements
Which of the following is not tetrahedral?
AIIMS - 2011
AIIMS
Chemistry
Hybridisation
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