List of top Chemistry Questions

Hofmann's bromamide reaction is to convert

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

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

Ammonium ion is

Which of the following has highest ionic radii?

Which of the following is not a peroxy acid?

Which of these do not form Grignard reagent?

Which one of the following is most reactive towards electrophilic reagent?

Which of the following does, not show $S _{ N _{2}}$ reaction?

Which of the following compounds has the lowest melting point ?

What is the value of electron gain enthalpy of $Na^+$ if $IE_1$ of $Na = 5.1 \, eV$?

$ {BaO_2}$ and ozone reacts to produce

Bleaching powder is obtained by treating $ {Cl_2}$ with

An electron moves away from the nucleus, its potential energy

Colour imparted to the flame by $Ba^{2+}$ is

Which one of the following is paramagnetic?

Which of the following molecular spedes has impaired electron(s) ?

Which one of the following have lowest $pK_a$?

One mole of oxygen at $273\, k$ and one mole of sulphur dioxide at $546 \,k$ are taken in two separate containers, then,

Aluminium oxide is not reduced by chemical reactions since

A gas absorbs a photon of $355 nm$ and emits at two wavelengths. If one of the emissions is at $680 nm$, the other is at:

The value of enthalpy change ($\Delta$H) for the reaction $C_{2}H_{5}OH_{\left(I\right)} + 3O_{2\left(g\right)} \to 2CO_{2\left(g\right)} + 3H_{2}O_{\left(I\right)}$ at $27^{\circ}C$ is $-1366.5 \,kJ \,mol^{-1}.$ The value of internal energy change for the above reaction at this temperature will be :

The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I, having atomic number 9, 17, 35 and 53 respectively, is:

The molecular velocity of any gas is: