List of top Chemistry Questions asked in WBJEE

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

Which one of the following has the lowest ionization energy?

The correct order of decreasing acidity of nitrophenols will be

The bond order of $CO$ molecule is

On mixing certain alkane with chlorine and irradiating it with ultraviolet light,it forms only one mono-chloroalkane. The alkane is :

When a manganous salt is fused with a mixture of $KNO_3$ and solid $NaOH$ the oxidation number of $Mn$ changes from $+2$ to

Which of the following orders regarding ionization energy is correct ?

In hemoglobin the metal ion present is

$P_4O_{10}$ is the anhydride of

Keto-enol tautomerism is not observed in

The potential of a hydrogen electrode at $pH = 10$ is

For a reversible chemical reaction where the forward process is exothermic, which of the following statements is correct ?

The molarity of a $NaOH$ solution by dissolving $4 \,g$ of it in $250\, ml$ water is

In the reaction of sodium thiosulphate with $I_2$ in aqueous medium, the equivalent weight of sodium thiosulphate is equal to

Calculate $K_{C}$ for the reversible process given below if $K_{P}=167$ and $T=800^{\circ} C$ $CaCO _{3}( s ) \rightleftharpoons CaO ( s )+ CO _{2}( g )$

$0.1\, (M)\, HCl$ and $0.1\, (M)\, H_2SO_4$ each of volume $2ml$ are mixed and the volume is made up to $6\, ml$ by adding $2\,ml$ of $0.01\, (N)\, NaCl$ solution. The $pH$ of the resulting mixture is

At identical temperature and pressure, the rate of diffusion of hydrogen gas is $3\sqrt{3}$ times that of a hydrocarbon having molecular formula $C_{n}H_{2n-2}$. What is the value of $'n'$ ?