List of top Chemistry Questions

Identify the reagents $(X, Y, Z)$ used in the conversion of $3$-methylaniline to $3$-nitrotoluene.

Find the hydrolysis product of maltose.

Copper crystallises in a face centred cubic lattice with a unit cell length of $361\, pm$. What is the radius of copper atom in $pm$ ?

Consider the following reaction: $C_2H_5OH + H_2SO_4 \to$ Product Among the following, which one cannot be formed as a product under any conditions?

Boron cannot form which one of the following anions?

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 of the following is not tetrahedral?

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

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

When conc. $H _{2} SO _{4}$ is heated with $P _{2} O _{5}$, the acid is converted into

The correct order in which the first ionisation potential increases is

Hofmann's bromamide reaction is to convert

Nitration of nitrobenzene at $125^{\circ} C$ with mixed acids gives

Ammonium ion is

Which of the following has highest ionic radii?