List of top Chemistry Questions asked in WBJEE

Under identical conditions, the $S_N1$ reaction will occur most efficiently with

Which one of the following is wrong about molecularity of a reaction?

The weight of oxalic acid that will be required to prepare a $1000\, mL$ $\left(\frac{N}{20}\right)$ solution is

Equal weights of $CH_{4}$ and $H_{2}$ are mixed in an empty container at $25^\circ C$. The fraction of the total pressure exerted by $H_{2}$ is

In a reversible chemical reaction at equilibrium, if the concentration of any one of the reactants is doubled, then the equilibrium constant will

Which of the following does not represent the mathematical expression for the Heisenberg uncertainty principle?

An equimolar mixture of toluene and chlorobenzene is treated with a mixture of conc. $H_{2} SO_{2}$ and conc. $HNO_{3}.$ Indicate the correct statement from the following.

The $sp^3d^2$ hybridization of central atom of a molecule would lead to

The standard reduction potential $E^o$ for half reations are $Zn = Zn^{2+} + 2e^- ;\,\,E^o = +0.76 V$ $Fe = Fe^{2+} + 2e^-;\,\, E^o = + 0.41 V$ The EMF of hte cell reaction $Fe^{2+} + Zn = Zn^{2+} + Fe$ is

The pH of an aqueous solution of $CH_3COONa$ of concentrated $C(M)$ is given by

$20\, mL$ of $0.2\, M \,NaOH$ is added to $50\, mL$ of $0.2\, M$ acetic acid. The pH of this solution after mixing is $(Ka = 1.8 \times 10^{-5})$

The normality of $30$ volume $H_2O_2$ is

$2\,gm$ of metal carbonate is neutralized completely by $100 \,mL$ of $0.1 \,(N) \,HCl$. The equivalent weight of metal carbonate is

Two soap bubbles of radii $x$ and $y$ coalesce to constitute a bubble of radius $z$. Then $z$ is equal to

If the equilibrium constants of the following equilibria ${SO_{2(g)} +\frac{1}{2}O2 <=> SO3$ $ and\, 2SO_{3(g)} <=> 2SO_{2(g)} +O_{2(g)}}$ are given by $K_1$ and $K_2$ respectively, which of the following relations is correct

Two aromatic compounds having formula $C_7H_8O$ which are easily identifiable by $FeCl_3$ solution test (violet colouration) are

Reaction of formaldehyde and ammonia gives

Which of the following compounds has maximum volatility?

The amount of the heat released when $20\,mL$ $0.5\, M\, NaOH$ is mixed with $100\, mL\, 0.1\, M\, HCl$ is $x\, kJ$. The heat of neutralization is

The ease of Nitration of the following three hydrocarbons follows the order

Among the alkenes which one produces tertiary butyl alcohol on acid hydration

If the molecular wt. of $Na_2S_2O_3$ and $I_2$ are $M_1$ and $M_2$ respectively, then what will be the equivalent wt. of $Na_2S_2O_3$ and $I_2$ in the following reaction? $\ce{2S2O^{2-}_3 + I2-> S4O^{2-}_6 + 2I-}$

Which one of the following will show optical isomerism?

The ease of dehydrohalogenation of alkyl halide with alcoholic $KOH$ is

Hybridization of $C_2$ and $C_3$ of $H_3C - CH = C = CH - CH_3$ are