List of top Chemistry Questions asked in WBJEE

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
Addition of sodium thiosulphate solution to a solution of silver nitrate gives $X$ as white precipitate, insoluble in water but soluble in excess thiosulphate solution to give $Y$. On boiling in water, $Y$ gives $Z . X, Y$ and $Z$ respectively are
Match the flame colours of the alkaline earth metal salts in the Bunsen burner.
In the following compound, the number of ?sp? hybridized carbon is
A piece of wood from an' archaeological sample has $5.0$ counts $\min ^{-1}$ per gram of $C-14$, while a fresh sample of wood has a count of $15.0 \,min ^{-1} \,g ^{-1}$. If half-life of $C-14$ is $5770\, yr$, the age of the archaeological sample is
The protein component of a holoenzyme is known as
The compressibility factor $(Z)$ of one mole of a van der Waals gas of negligible $�a�$ value is
The volume of ethyl alcohol (density $1.15\, g/cc$) that has to be added to prepare $100\,cc$ of $0.5\, M$ ethyl alcohol solution in water is
$\left(_{32}Ge^{76}, _{34}Se^{76}\right)$ and $\left(_{14}Si^{30}, _{16}S^{32}\right)$ are examples of
The order of decreasing ease of abstraction of Hydrogen atoms in the following molecule is
Among the following statements about the molecules $X $ and $Y$, the one (s) which is (are) correct is (are)
The formal potential of $Fe ^{3+} / Fe ^{2+}$ in a sulphuric acid and phosphoric acid mixture $\left(E^{\circ}=+0.61 \,V \right)$ is much lower than the standard potential $\left(E^{\circ}=+0.77 \,V \right) .$ This is due to
The disease that occurs in mature adult human being due to deficiency of calciferol is