List of top Questions asked in AIIMS- 2007

Which of the following is true?

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 phase difference between the instantaneous velocity and acceleration of a particle executing simple harmonic motion is

Drosophila flies with $XXY$ genotype are females, but human beings with such genotype are abnormal males, it shows that

Pure line breed refers to

Chain transfer reagent is

The figure shows the path of a positively charged particle 1 through a rectangular region of uniform electric field as shown in the figure. What is the direction of electric field and the direction of deflection of particles 2, 3 and 4?

Ohm?? law is applicable for all conducting elements. Ohm?? law is a fundamental law.

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?

A large horizontal surface moves up and down in $S.H.M.$ with an amplitude of $1\, cm$. If a mass of $10\, kg$ (which is placed on the surface) is to remain continuously in contact with it, the maximum frequency of S.H.M. will be

In a cavity within a conductor, the electric field is zero. Charges in a conductor reside only at its surface.

: 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.

Which of the following statement is true?

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

"Omnis-cellula-e-cellula" was given by

In maize, hybrid vigour is exploited by

At the high pressure, Langmuir adsorption isotherm takes the form

Sound waves cannot travel in vacuum but light can travel in vacuum. Sound waves are longitudinal waves and they cannot be polarised but electromagnetic waves are transverse and they can be polarised.