List of top Chemistry Questions asked in WBJEE

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

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

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

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

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

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

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 :

The shape of $XeF_{5}^{-}$ will be

Which of the following is true in respect of adsorption?

The equilibrium constant for the reaction $N_{2} +3H_{2} {\rightleftharpoons} 2NH_{3}$ is ?K?. Then, the equilibrium constant for the reaction $2N_{2}+6H_{2} {\rightleftharpoons} 4NH_{3}$ will be

Which of the following compounds is least effective in precipitating $Fe\left(OH\right)_{3}$ sol.?

Pressure (P) vs. density (D) curve for an ideal gas at two different temperatures $T_{1} andT_{2}$ is shown below. Identify the correct statement about $T_{1}and T_{2}$:

Consider the following reaction: $6NaOH +3cl_{2} \to5Nacl +A+3H_{2}O$ What is the oxidation number of chlorine in A?

Amongst the following compounds, the one which would not form a white precipitate with ammonical silver nitrate solution is

Which one of the following does not produce $O_{2}$ as the only gaseous product on heating?

Assign the Bravais lattice type of the following unit cell structure.