List of top Chemistry Questions

Lucas test is done for:

Ketones react with $Mg - Hg$ over water gives :

For a spontaneous reaction the $\Delta$G, equilibrium constant (K) and $E^{\circ}_{cell}$ will be respectively :

Elimination of bromine from 2-bromobutane results in the formation of :

Calomel $(Hg_2Cl_2)$ on reaction with ammonium hydroxide gives :

Benedict's solution is not reduced by

$SiF_6^{2-}$ is known but $SiCl_6^{2-}$ is not. Size of fluorine is small and its lone pair of electrons interacts with d-orbitals of $Si$ strongly.

Reaction of $SO_2$ and $H_2S$ in the presence of $Fe_2O_3$ catalyst gives elemental sulphur. $SO_2$ is a reducing agent.

Rates of nitration of benzene and hexadeuterobenzene are different. $C - H$ bond is stronger than $C - D$ bond.

Ozone is a powerful oxidising agent in comparison to $O_2$ . Ozone is diamagnetic but $O_2$ is paramagnetic.

First ionisation energy for nitrogen is lower than oxygen. Across a period effective nuclear charge decreases.

Cyclopentadienyl anion is much more stable than allyl anion. Cyclopentadienyl anion is aromatic in character.

An organic compound having molecular mass 60 is found to contain C = 20%, H = 6.67% and N = 46.67% while rest is oxygen. On heating it gives $NH_3$ alongwith?? solid residue. The solid residue give violet colour with alkaline copper sulphate solution. The compound is :

Which one of the following compounds is most acidic?

Among the following acids which has the lowest $pK_a$ value ?

Alkyl halides react with dialkyl copper reagents to give:

Alcohols are isomeric with :

A nuclide of an alkaline earth metal undergoes radioactive decay by emission of three $\alpha$-particles in succession. The group of the periodic table to which the resulting daughter element would belong is

Which of the properties of interstitial hydrides is correct ?

Which amongst the following is the most stable carbocation?

In a face centred cubic (fcc) lattice, a unit cell is shared equally by how many unit cells?

$ {{H}_{2}}{{O}_{2}} $ is manufactured these days:

Strongest nucleophile is:

An atom of an element $A$ has three electrons in its outermost orbit and that of $B$ has six electrons in its outermost orbit. The formula of the compound between these two will be

Which one of the following compounds is most acidic ?