List of top Chemistry Questions asked in WBJEE

The number of unpaired electrons in $Mn^{2+}$ ion is
The correct bond order of B-F bond in BF3 molecule is:
The correct pair of electron affinity order is:
The metal-pair that can produce nascent hydrogen in alkaline medium is:
The correct statement(s) about B2H6 is/are:
Let (Cms)H2 be the r.m.s speed of H2 at 150 K. At what temperature, the most probable speed of helium [(Cmp)He] will be half of (Crms)H2?
Pick the correct statement:
The correct order of acidity of the following hydra acids is:
Hybridisation of the negative carbons in (1) and (2) are:
Hybridisation of the negative carbons
The number of atoms in body-centred and face-centred cubic unit cell respectively are
Which of the following would produce enantiomeric products when reacted with methyl magnesium iodide?
How many monobrominated product(s) (including stereoisomers) would form in the free radical bromination of n-butane?
What is the correct order of acidity of salicylic acid, 4-hydroxybenzoic acid, and 2,6-dihydroxybenzoic acid?
The enol form in which ethyl-3-oxobutanoate exists is
The correct order of relative stability of the given conformers of n-butane is
order of relative stability
The major product of the following reaction is $F_3C \rightarrow CH = CH_2 + HBr$
The correct order of relative stability for the given free radical is:
$1$ mL of water has $25$ drops. Let $N_A$ be the Avogadro number. What is the number of molecules present in $1$ drop of water? (Density of water = $1$ g/mL)
The product of the following hydrogenation reaction is:
Which of the following is the correct set of four quantum numbers ($n$, $l$, $m$, $s$)?
The de-Broglie wavelength ($\lambda$) for electron ($e$), proton ($p$), and He²⁺ ion ($\alpha$) are in the following order, Speed of $e$, $p$, and $\alpha$ are the same
The product of the following reaction is:
To a solution of colourless sodium salt, a solution of lead nitrate was added to have a white precipitate which dissolves in warm water and reprecipitates on cooling. Which of the following acid radical is present in the salt?
Which of the following is radioactive?
A sample of MgCO3 is dissolved in dilute HCl and the solution is neutralized with ammonia and buffered with NH4Cl / NH4OH. Disodium hydrogen phosphate reagent is added to the resulting solution. A white precipitate is formed. What is the formula of the precipitate?