List of top Chemistry Questions asked in WBJEE

Which is least thermally stable?

The main reason the $SiCl_4$ is easily hydrolysed as compared to $CCl_4$ is that

The ease of hydrolysis in the compounds $CH _{3} COCl ( I ), CH _{3}- CO - O - COCH _{3}( II )$ $CH _{3} COOC _{2} H _{5}( III )$ and $CH _{3} CONH _{2}( IV )$ is of the order

During a reversible adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio $\frac{C_P}{C_V}$ for the gas is

What amount of electricity can deposit $1$ mole of $Al$ metal at cathode when passed through molten $AlCl_3$

The correct order of reactivity for the addition reaction of the following carbonyl compounds with ethylmagnesium iodide is

Which of the following has the strongest H-bond ?

How many moles of electron weight one kilogram :

A metal $M$ (specific heat $0.16$) forms a metal chloride with $= 65\%$ chlorine present in it. The formula of the metal chloride will be

White phosphorus $P_4$ has the following characteristics:

The number of unpaired electrons in $Ni$ (atomic number $= 28)$ are

$Cl_2O_7 $ is the anhydride of

When $BaCl_2$ is added to an aqueous salt solution, a white precipitate is obtained. The anion among $CO_3^{ 2-}, SO_3^{ 2-}$ and $SO_4^{ 2-}$ that was present in the solution can be :

$C_{6}H_{5}F^{18}$ is a $F^{18}$ radio-isotope labelled organic compound. $F^{18}$ decays by positron emission. the product resulting on decay is

Reduction of the lactol  OH with sodium borohydride gives

In a close-packed body-centred cubic lattice of potassium, the correct relation between the atomic radius $(r)$ of potassium and the edge-length $(a)$ of the cube is

The ground state magnetic property of $B_2$ and $C_2$ molecules will be

Which of the following atoms should have the highest $1^{\text{st}]$ electron affinity?

How many faradays are required to reduce $1\, mol$ of $Cr_{2} O_{7}^{2-}$ to $Cr^{3+}$ in acid medium?

In a flask, the weight ratio of $CH _{4}( g )$ and $SO _{2}(g)$ at $298 \,K$ and 1 bar is $1: 2$. The ratio of the number of molecules of $SO _{2}(g)$ and $CH _{4}(g)$ is

Dissolving $NaCN$ in de-ionized water will result in a solution having

Among $Me_3N, C_5H_5N$ and $MeCN$ ($Me$ = methyl group) the electronegativity of $N$ is in the order

Of the following compounds, which one is the strongest Bronsted acid in aqueous solution?

$PbCl_2$ is insoluble in cold water. Addition of $HCl$ increases its solubility due

The number of unpaired electrons in $\left[NiCl_{4}\right]^{2-}, Ni\left(CO\right)_{4}$ and $\left[Cu\left(NH_{3}\right)_{4}\right]^{2+}$ respectively are :