List of top Questions asked in AIIMS

Sinus venosus is a thin-walled sac with little muscular tissue in primitive heart. It receives venous blood through the hepatic veins.

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.

: $pH $ of neutral solution is always $7$. : $pH$ of a solution does not depend upon temperature.

: $p$-dichlorobenzene is less soluble in organic solvents than the corresponding $o$-isomer. : $o$-dichlorobenzene is polar while $p$-dichlorobenzene is not

Now-a-days amniocentesis is banned. Amniocentesis gives the information of any abnormality in the foetus and many other complications regarding pregnancy can be detected.

$ NaCl $ is less soluble in heavy water than in ordinary water. Dielectric constant of ordinary water is more than that of heavy water.

$C_{p}$ can be less than $C_{V}$. $C_{p} C_{V}=R$ is valid only for ideal gases.

Magnification of a convex mirror is always positive, but that of a concave mirror may be both positive or negative. It depends on the sign convention chosen.

$KE$ is conserved at every instant of elastic collision. No deformation of matter occurs in elastic collision.

In the transmission of long distance radio signals, short wave band is used. In shorter wavelength, attenuation is very less.

Helium is used in diving apparatus. Solubility of helium is less in blood.

$H_2S$ is less acidic than $H_2$ Te Te has larger radius than S.

Fructose is a reducing sugar. It has a ketonic group.

Blood in cockroach is colourless haemolymph with no respiratory pigment. Respiration in cockroach occurs through diffusion in haemolymph.

: 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.

Algal blooms are formed in nutrientless water. Algal blooms in water turn it unfit for human consumption, but cause enormous growth of fish.

A mangrove tree growing in marshy place has pneumatophores. Pneumatophores help in better anchorage to marshy soil.

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

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

Which one of the following noble gases is used in miners cap lamps?

Which of the following is not tetrahedral?

$CH _{3} COOH \xrightarrow{ LiAlH _{4}}A + CH _{3} COOH \xrightarrow{ H _{3} O ^{+}} B + H _{2} O$ In the above reactions ' $A$ ' and ' $B$ ' respectively are

$138\, g$ of ethyl alcohol is mixed with $72\, g$ of water. The ratio of mole fraction of alcohol to water is

In which of the following groups are seeds present?

Ergotamine tartarate extracted from Claviceps, is used for cure of