List of top Chemistry Questions asked in WBJEE

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

Among the following groupings, which one represents the set of iso-electronic species?

Which property that polyacetylene exhibits is unusual for an organic polymer?

Which structure for $XeO_{3} \, and XeF_{4}$ are consistent with the VSEPR model?

Which reaction is not appropriate for the synthesis of the following?

The spin-only magnetic moment of $\left[crF_{6}\right]^{4-}$ (atomic number of Cr is 24) is

75% of a first order reaction was completed in 32 min. When would 50% of the reaction completed?

The emf of a Daniel cell at 298 K is $E_{1}.\qquad$The cell is $Zn | ZnSO_{4} \left(0.01M\right)|| CuSO_{4} \left(1M\right) | CU$ When the concentration of $ZnSO_{4}$ is changed to 1M and that of $CuSO_{4}$ to 0.01M, the emf changes to E2.The relationship between $E_{1} and E_{2}$ will be

Of the following atoms, which one has the highest n/p ratio?

In the complex ion $\left[Cu\left(CN\right)_{4}\right]^{3-}$ the hybridization state, oxidation state and number of unpaired electrons of copper are respectively

The maximum number of 2p electrons with electronic spin $=-\frac{1}{2}$ are

For $N^{3-} >O^{2-}>F^{-} and Na^{+},$ the order in which their ionic radii varies is

Which of the following is the correct option for free expansion of an ideal gas under adiabatic condition?

The number of lone pair of electrons on the central atoms of $H_2O,\, SnCl_2,\, PCl_3$ and $XeF_2$ respectively, are

At a certain temperature, the value of the slope of the plot of osmotic pressure $(\pi)$ against concentration $\left(C\right.$ in $mol\, L ^{-1}$ ) of a certain polymer solution is $291\, R$. The temperature at which osmotic pressure is measured, is $(R$ is gas constant)

Suppose the mass of a single Ag-atom is $m$. Ag metal crystallises in fcc lattice with unit cell of length $a$. The density of $Ag$ metal in terms of $a$ and $m$ is

Sulphuryl chloride $(SO_2Cl_2)$ reacts with white phosphorus $(P_4)$ to give

In aqueous alkaline solution, two electron reduction of $HO^-_2$ gives

The physical states of dispersed phase and dispersion medium in colloid like pesticide spray respectively are

Cold ferrous sulphate solution on absorption of $NO$ develops brown colour due to the formation of

A gas can be liquefied at temperature $T$ and pressure $P$ provided

Consider the following salts: $NaCl,\, HgCl_2,\, Hg_2Cl_2,\, CuCl_2,\, CuCl$ and $AgCl$. Identify the correct set of insoluble salts in water

In a mixture, two enantiomers are found to be present in $85\%$ and $15\%$ respectively. The enantiomeric excess $(e, e)$ is

For the reaction $A+2 B \longrightarrow C$, the reaction rate is doubled, if the concentration of $A$ is doubled. The rate is increased by four times when concentrations of both $A$ and $B$ are increased by four times. The order of the reaction is

The RMS velocity of $CO$ gas molecules at $27^{\circ}$C is approximately $1000\, m/s$. For $N_2$ molecules at $600 \,K$ the RMS velocity is approximately