List of top Chemistry Questions asked in AIIMS

When phenol reacts with phthalic anhydride in presence of $H _{2} SO _{4}$ and heated and hot reaction mixture is poured in $NaOH$ solution, then product formed is
The flame colours of metal ions are due to
Tropylium cation is aromatic in nature.
The only property that determines its aromatic behaviour is its planar structure.
Colloidal solutions are stable but colloidal particles do not settle down. Brownian movement counters the force of gravity actively on colloidal particles.
Bleaching powder reacts with dilute acids to evolve chlorine. The chlorine liberated by the action of dilute acids on bleaching powder is called available chlorine.
$0.01 M$ solution of $KCl$ and $BaCl _{2}$ are prepared in water. The freezing points of $KCl$ is found to be $-2{ }^{\circ} C$. What is the freezing point of $BaCl _{2}$ to be completely ionised?
Non-oxide ceramics can be
A unit cell of sodium chloride has four formula units. The edge length of the unit cell is $0.0564\, nm$. What is the density of sodium chloride?
The chemical formula of 'tear gas" is
Non-oxide ceramics can be
The half-life for the reaction $N _{2} O _{5} \longrightarrow 2 NO _{2}+\frac{1}{2} O _{2}$ is $2.4\, h$ at STP. Starting with $10.8\, g$ of $N _{2} O _{5}$ how much oxygen will be obtained after a period of $9.6\, h$ ?
The solubility product of $As _{2} O _{3}$ is $10.8 \times 10^{-9}$. It is $50 \%$ dissociated in saturated solution. The solubility of salt is
The enthalpy of hydrogenation of cyclohexene is $-119.5\, kJ\, mol ^{-1}$. If resonance energy of benzene is $-150.4\, kJ\, mol ^{-1}$, its enthalpy of hydrogenation would be

The basic character of the transition metal monoxides follows the order

Chain transfer reagent is
The vapour pressure of pure benzene at a certain temperature is $0.850$ bar. A non-volatile, nonelectrolyte solid weighing $0.5\,g$ is added to $39.0\, g$ of benzene (molar mass 78 g/mol). The vapour pressure of the solution then is 0.845 bar. What is the molecular mass of the solid substance?
: In the electrolysis of aqueous $ NaCl $ , $ Na $ is preferentially discharged at mercury cathode forming sodium amalgam. : It is due to the fact that hydrogen has a high over voltage at mercury cathode.
The lactic acid shows the geometrical isomerism. Lactic acid has carbon-carbon double bond.
Mixture of $CH_3COOH$ and $CH_3COONH_4$ is an example of acidic buffer. Acidic buffer contains equimolar mixture of weak acid and its salt with weak base.
Plexiglass is a commercial name of
Rayon is
Propene on hydroboration and oxidation produces
At the high pressure, Langmuir adsorption isotherm takes the form
$XeF_6$ on complete hydrolysis produces
The element which is the most abundant in the earth crust is