List of top Chemistry Questions asked in WBJEE

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
$2N HCl$ solution will have same molar concentration as a
Addition of sodium acetate to $0.1 \,M$ acetic acid will cause
The $IUPAC$ name of $CH_{3}-CH=CH-C \equiv CH$ is
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
An unknown element forms an oxide. What will be the equivalent weight of the element if the oxygen content is $20\%$ by weight?
$1$ mole of methyl amine on reaction with nitrous acid gives at $NTP$
Which one of the following pairs is obtained on heating ammonium dichromate?
Which of the following expressions gives the de-Broglie relationship?
Which of the following acids has the smallest dissociation constant?
When $KI$ is added to acidified solution of sodium nitrite, then
Distillation of acetone with concentrated sulphuric acid gives
The orbital angular momentum of an electron in $ 2s $ -orbital is
$ 4.6\times {{10}^{22}} $ atoms of an element weigh $13.8\,g$. The atomic weight of that element is
Which one of the following compounds has $ s{{p}^{2}} $- hybridisation?
Number of lone pair (s) in $ XeO{{F}_{4}} $ is/are
Which of the following has the smallest number of molecules?
The decomposition of hydrogen peroxide can be slowed by the addition of acetamide. The latter acts as a
The starting material used in Solvas process are
The half-life period of radioactive element is $140$ days. After $560$ days, $1$ gram of element will reduce to
If molecular weight of $ KMn{{O}_{4}} $ is $M$, then its equivalent weight in acidic medium would be