List of top Chemistry Questions asked in WBJEE

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?
The correct statement(s) about B2H6 is/are:
The product of the following hydrogenation reaction is:
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?
The correct bond order of B-F bond in BF3 molecule is:
Sodium nitroprusside is:
Hybridisation of the negative carbons in (1) and (2) are:
Hybridisation of the negative carbons
The enol form in which ethyl-3-oxobutanoate exists is
The correct order of acidity of the following hydra acids is:
The correct relationship between molecule I and II is:
correct relationship between molecule I and II
Which of the following is radioactive?
The major product of the following reaction is $F_3C \rightarrow CH = CH_2 + HBr$
XeF2, NO2, HCN, ClO2, CO2 Identify the non-linear molecule-pair from the above mentioned molecules.
The average speed of $H_2$ at $T_1$ K is equal to that of $O_2$ at $T_2$ K. The ratio $T_1:T_2$ is
The number of unpaired electrons in $Mn^{2+}$ ion is
The correct pair of electron affinity order is:
Avogadro's law is valid for
Pick the correct statement:
The metal-pair that can produce nascent hydrogen in alkaline medium is:
During the preparation of NH3 in Haber’s process, the promoter(s) used is/are:
The correct order of relative stability of the given conformers of n-butane is
order of relative stability
$1$ 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)
What is the correct order of acidity of salicylic acid, 4-hydroxybenzoic acid, and 2,6-dihydroxybenzoic acid?
The correct order of relative stability for the given free radical is:
Oxidation states of Cr in K2Cr2O7 and CrO5 are, respectively: