List of top Chemistry Questions asked in AIIMS

The pH of stomach is $1.6$, then which enzyme will digest protein?

Schottky defect is

Iodine oxidises sodium borohydride to give

In the van der Waals equation, 'a' signifies

If the bond dissociation energies of $X Y, X_{2}$ and $Y_{2}$ (all diatomic molecules) are in the ratio of $1: 1: 0.5$ and $\Delta H_{f}$ for the formation of $X Y$ is $-200\, kJ \,mol ^{-1}$. The bond dissociation energy of $X_{2}$ will be

Find the hydrolysis product of maltose.

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

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

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.

: 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.

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

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

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

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 of the following is not tetrahedral?

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

Which of the following is not a peroxy acid?

$S_N2$ reaction readily occurs in

$\beta$-pleated sheet structure of protein shows maximum extension. Intermolecular hydrogen bonding is present in them.

The correct increasing order of reactivity for the following molecules towards electrophilic aromatic substitution is

The correct decreasing order of $pK_a$ is