List of top Chemistry Questions asked in WBJEE

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 $'n'$ ?

Which of the following thermodynamic relation is correct ?

Which of the following is most abundant in the earth's crust ?

In Periodic Table, the basic character of oxides

If a species has $16$ protons, $18$ electrons and $16$ neutrons, find the species and its charge

In Sommerfeld?s modification of Bohr?s theory, the trajectory of an electron in a hydrogen atom is

The half-life of a radioactive element is 10 hours. How much will be left after 4 hours in 1 g atom sample?

Of the following compounds the most acidic is

The monomer used to produce orlon is

The catalyst used for olefin polymerization is

Which one of the following formulae does not represent an organic compound?

Which one of the following is called a carbylamine?

$1$ mole of photon, each of frequency $2500\,s^{-1},$ would have approximately a total energy of :

The time taken for $10\%$ completion of a first order reaction is $20$ minutes. Then for $19\%$ completion the reaction will take

An organic compound made of $C, H$ and $N$ contains $20\%$ nitrogen. Its molecular weight is :

For the reaction $SO_{2} +\frac{1}{2} O_{2} =SO_{3,}$ if we write $K_{p}=K_{c} \left(RT\right)^{x},$ then x becomes

The equilibrium constant (K) of a reaction may be written as :

Which of the following will decrease the $pH$ of a $50\, ml$ solution of $0.01 \,M \,HCl$?

Which of the following carbocations will be most stable ?

In $Cu$-ammonia complex, the state of hybridization of $Cu^{+2}$ is

For the Paschen series the values of $n_{1}$ and $n_{2}$ in the expression $\Delta E=Rhc\left(\frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}}\right)$ are

For making distinction between $2$-pentanone and $3$-pentanone the reagent to be employed is