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AIIMS
List of top Questions asked in AIIMS
More energy is released in fusion than fission. More number of nucleons take part in fission.
AIIMS - 2012
AIIMS
Physics
Nuclei
van-Arkel method is used to prepare samples of some metals. It involves reaction of
$CO$
with metals to form volatile carbonyls which decompose on heating to give pure metal.
AIIMS - 2012
AIIMS
Chemistry
Refining
The presence of nitro group facilitates nucleophilic substitution reactions in aryl halides. The intermediate carbanion is stabilised due to the presence of nitro group.
AIIMS - 2012
AIIMS
Chemistry
Chemical Reactions
The free gaseous Cr atom has six unpaired electrons. Half-filled s-orbital has greater stability.
AIIMS - 2012
AIIMS
Chemistry
properties of d block elements
Sodium carbonate extract of a salt containing sulphide ions gives a violet colour with appropriate reagent. The reagent sodium nitroprusside gives violet colour due to the formation of sodium thionitroprusside.
AIIMS - 2012
AIIMS
Chemistry
GROUP 1 ELEMENTS
Sodium acetate on Kolbe?? electrolysis gives methane. Methyl free radical is formed at cathode.
AIIMS - 2012
AIIMS
Chemistry
Hydrocarbons
Precipitation of soap is made by the addition of salt
$(NaCl)$
. Presence of common ion suppresses the dissociation of weak acid.
AIIMS - 2012
AIIMS
Chemistry
Ionic Equilibrium In Solution
Phenol is more reactive than benzene towards electrophilic substitution reaction. In the case of phenol, the intermediate carbocation is more resonance stabilised.
AIIMS - 2012
AIIMS
Chemistry
Alcohols, Phenols and Ethers
In a terrestrial ecosystem, detritus food chain is the major conduit for energy flow. Solar energy is the direct source for energy supply in a detritus food chain.
AIIMS - 2012
AIIMS
Biology
energy flow through ecosystems
Histones are basic protein of major importance in packaging of eukaryotic
$DNA. DNA$
and histone comprise chromatine forming bulk of eukaryotic chromosome. Histones are five major types
$H_{l},\, H_{2}A,\, H_{2}B,\, H_{3}\, and\, H_{4}$
.
AIIMS - 2012
AIIMS
Biology
Structure of DNA and RNA
HC
$=$
C
$^{-}$
is more stable than HC
$=$
CH
$^{-}$
. HC
$=$
C
$^{-}$
has more s-character than HC
$=$
CH
$^{-}$
.
AIIMS - 2012
AIIMS
Chemistry
Hydrocarbons
$H_2Se$
is less acidic than
$H_2S$
.
$S$
is less electronegative than
$Se$
.
AIIMS - 2012
AIIMS
Chemistry
p -Block Elements
$[Fe(H_2O)_5NO]SO_4$
is paramagnetic. The
$Fe$
in
$[Fe(H_2O)_5NO]SO_4$
has three unpaired electrons.
AIIMS - 2012
AIIMS
Chemistry
coordination compounds
Diamond and graphite do not have the same crystal structure. Diamond is crystalline while graphite is amorphous.
AIIMS - 2012
AIIMS
Chemistry
p -Block Elements
$ClF_3$
has T-shape structure. It has two lone pairs arranged at 180
$^{\circ}$
angle.
AIIMS - 2012
AIIMS
Chemistry
Chemical bonding and molecular structure
$BF_3$
molecule is planar but
$NF_3$
is pyramidal. N atom is smaller than B.
AIIMS - 2012
AIIMS
Chemistry
Hybridisation
AIDS is caused by the HIV, a retrovirus. Retroviruses have RNA genome.
AIIMS - 2012
AIIMS
Biology
human health and disease
Apiculture is associated with which of the following groups of plants?
AIIMS - 2012
AIIMS
Biology
Strategies For Enhancement in Food Production
An artificial satellite moving in a circular orbit around the earth has a total (kinetic
$+$
potential) energy
$E_0$
. Its potential energy is
AIIMS - 2012
AIIMS
Physics
Gravitational Potential Energy
Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionization enthalpy?
AIIMS - 2012
AIIMS
Chemistry
properties of d block elements
The aqueous solution containing which one of the following ions will be colourless? (Atomic number of
$Sc = 21, Fe = 26, Ti = 22, Mn = 25$
)
AIIMS - 2012
AIIMS
Chemistry
properties of d block elements
What is the correct relationship between the
$pHs$
of isomolar solutions of sodium oxide
$(pH_1)$
, sodium sulphide
$(pH_2)$
, sodium selenide
$(pH_3)$
and sodium telluride
$(pH_4)$
?
AIIMS - 2012
AIIMS
Chemistry
Acids and Bases
Freon used as refrigerant is
AIIMS - 2012
AIIMS
Chemistry
Chemical Reactions
Which has the highest nucleophilicity?
AIIMS - 2012
AIIMS
Chemistry
Classification Of Organic Compounds
Of the following, the oxime of which shows geometrical isomerism is
AIIMS - 2012
AIIMS
Chemistry
Isomerism
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