List of top Chemistry Questions

Which one of the following has the smallest heat of hydrogenation per mole ?

Equal weights of ethane and hydrogen are mixed in an empty container at $25^\circ$ C. The fraction of the total pressure exerted by hydrogen is

Increasing order of acidic strength among p-methoxy phenol (I), p-methyl phenol (II) and p-nitrophenol (III) is

Electronic configuration of calcium atom can be written as

Elements of which of the following groups will form anions most readily?

The correct value of the gas constant 'R' is close to

$H_3PO_2$ is the molecular formula of an acid of phosphorous. Its name and basicity respectively are

The energy of an electron in the $nth$ Bohr orbit of H - atom is

When phenol is treated with excess of bromine water, it gives

Bakelite is a product of the reaction between

A is a lighter phenol and B is an aromatic carboxylic acid. Separation of a mixture of A and B can be carried out easily by using a solution of

At its melting point ice is lighter than water because

Strength hydrogen bonding is shown by

Water gas is produced by

Which one is a colligative property?

Sugarcane on reaction with nitric acid gives

0.1M solution of which one of these substances will be basic?

Methanol is industrially prepared by

For carbylamine reaction, we need hot alc. KOH and

HBr reacts fastest with

Among the following compound one that is most reactive towards electrophilic nitration is

An ideal gas cannot be liquefied because

How many isomers of $C_5 H_{11} OH$ will be primary alcohols?

Hydrogen bond is strongest in

When chlorine is passed over dry slaked lime at room temperature ,the main reaction product is