List of top Chemistry Questions asked in WBJEE

The correct pair of electron affinity order is:

The correct order of acidity of the following hydra acids is:

Which of the following is radioactive?

The boiling point of water is higher than liquid HF. The reason is that:

Oxidation states of Cr in K2Cr2O7 and CrO5 are, respectively:

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?

Choose the correct statement for the [Ni(CN)4]²⁻ complex ion (Atomic no. of Ni = 28)

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 metal-pair that can produce nascent hydrogen in alkaline medium is:

XeF2, NO2, HCN, ClO2, CO2 Identify the non-linear molecule-pair from the above mentioned molecules.

The correct bond order of B-F bond in BF3 molecule is:

The number of atoms in body-centred and face-centred cubic unit cell respectively are

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

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 number of unpaired electrons in $Mn^{2+}$ ion 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)

In Bohr's model of the atom, the radius of a hydrogen atom in the ground state is $r_1$ and the radius of a He+ ion in the ground state is $r_2$. Which of the following is correct?