List of top Chemistry Questions asked in WBJEE

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 :

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 $0.01 \,M \,HCl$?

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

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

"Electron" is an alloy of

Atoms in a $P_{4}$ molecule of white phosphorus are arranged regularly in the following way :

The oxidant which is used as an antiseptic is :

$2N HCl$ solution will have same molar concentration as a

Unusual high boiling point of water is result of

The electronic configuration $1 s^{2},\, 2 s^{2} 2 p^{6},\, 3 s^{2} 3 p^{6} 3 d^{9}$ represents a

Benzoylation of phenol in alkaline medium is known as

The $IUPAC$ name of $CH_{3}-CH=CH-C \equiv CH$ is

Addition of sodium acetate to $0.1 \,M$ acetic acid will cause

The major product $P$ in the following reaction is $ C{{H}_{3}}-CH=C{{H}_{2}}\xrightarrow[Peroxide]{HI}P $

In a given shell the order of screening effect is

In transforming $0.01$ mole of $PbS$ to $PbSO _{4}$, the volume of ' $10$ volume' $H _{2} O _{2}$ required will be

Sodium nitrate on reduction with $Zn$ in presence of $NaOH$ solution produces $NH_3$ Mass of sodium nitrate absorbing $1$ mole of electron will be