List of top Chemistry Questions asked in AIIMS

N?? bond length is minimum in
Magnetic moment of $Cr^{2+}$ is nearest to
In Bohr?? orbit, $\frac{nh}{2\pi}$ indicates
If $Si$ is doped with $B$,
Etherates are
$CsCl$ has $bcc$ arrangement. Its unit cell edge length is $400\,pm$. Its inter-ionic distance is
But-1-ene $ { ->[{(CH_3COO)_2Hg}][{H_3O^+}] }$ ? The product in the above reaction is
Bond dissociation energy of CH is 360 kJ/mol and CH is 620 kJ/mol. Then bond dissociation energy of C - C bond is
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.
The presence of nitro group facilitates nucleophilic substitution reactions in aryl halides. The intermediate carbanion is stabilised due to the presence of nitro group.
The free gaseous Cr atom has six unpaired electrons. Half-filled s-orbital has greater stability.
Sodium acetate on Kolbe?? electrolysis gives methane. Methyl free radical is formed at cathode.
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.
Precipitation of soap is made by the addition of salt $(NaCl)$. Presence of common ion suppresses the dissociation of weak acid.
Phenol is more reactive than benzene towards electrophilic substitution reaction. In the case of phenol, the intermediate carbocation is more resonance stabilised.
HC $=$ C$^{-}$ is more stable than HC $=$ CH$^{-}$. HC $=$ C$^{-}$ has more s-character than HC $=$ CH$^{-}$.
$H_2Se$ is less acidic than $H_2S$. $S$ is less electronegative than $Se$.
$[Fe(H_2O)_5NO]SO_4$ is paramagnetic. The $Fe$ in $[Fe(H_2O)_5NO]SO_4$ has three unpaired electrons.
Diamond and graphite do not have the same crystal structure. Diamond is crystalline while graphite is amorphous.
$ClF_3$ has T-shape structure. It has two lone pairs arranged at 180$^{\circ}$ angle.
$BF_3$ molecule is planar but $NF_3$ is pyramidal. N atom is smaller than B.
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?
The aqueous solution containing which one of the following ions will be colourless? (Atomic number of $Sc = 21, Fe = 26, Ti = 22, Mn = 25$)
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 $(pH_4)$?
Which has the highest nucleophilicity?