List of top Questions asked in WBJEE

63g of a compound (Mol.Wt.=126) was dissolved in 500g of distilled water.The density of the resultant solution is 1.126g/ml. The molarity of the solution is
Case-1: An ideal gas of molecular weight M at temperature T.
Case-2: Another ideal gas of molecular weight 2M at the temperature \(\frac{T}{2}\).
Identify the correct statement in the context of the above two cases.

The correct option for the above reaction is 

If all the nucleophilic substitution reactions at saturated carbon atoms in the above sequence of reactions follow Sn2 mechanism, then E and F will be respectively,
(i)(ii)(iii)(iv)
The correct order of acidity of above compound is 
Structure of M
Structure of M is

(i)

(ii)

(iii)

 

The relationship between the pair of compounds shown above is respectively,

(i)(ii)(iii)
The correct order of C = O bond length in ethyl propanoate(I), ethyl propenoate(II) and ethenyl propanoate(III) is
The IUPAC name of CH3CH=C-CHO-CH2-CH3 is:
Select the molecule in which all the atoms may lie on a single plane is 
The calculated spin-only magnetic moment values in BM for [FeCl4]- and [Fe(CN)6]3- are
Which of the following statements is incorrect? 
4f2 electronic configuration is found in
BrF3 self ionizes as following
The molecular shapes of SF4,CF4 and XeF4 are
The correct statement about the magnetic properties of [Fe(CN)6]3- and [FeF6]3- is
The species in which nitrogen atom is in a state of sp hybridisation is

The equivalent weight of KIO3 in the given reaction is (M=molecular mass) :
2Cr(OH)3 + 4OH + KIO3 → 2CrO42- + 5H2O +KI

A solution containing 4g of polymer in a 4.0-litre solution at 27°C shows an osmotic pressure of 3.0×10-4 atm. The molar mass of the polymer in g/mol is
Suppose a gaseous mixture of He,Ne,Ar and Kr is irradiated with photons of the frequency appropriate to ionize Ar,What ion(s) will be present in the mixture?
If in the case of a radio-isotope, the value of half-life(T1/2) and decay constant(λ) are identical in magnitude, then their value should be
Na2CO3 is prepared by Solvay process but K2CO3 can not be prepared by the same because
Which of the following would give a linear plot? (K is the rate constant of an elementary reaction and T is the temperature in absolute scale)
For the reaction A+B\(\rightarrow\)C, we have the following data:
Initial concentration of A(in molarity)Initial concentration of B (in molarity)Rate(initial)(Relevant unit)
110100
111
10110








The order of the reaction with respect to A and B are:
The equivalent conductance of NaCl, HCl, and CH3COONa at infinite dilution are 126.45, 426.16, and 91 ohm-1cm2eq-1 respectively at 25°C. The equivalent conductance of acetic acid(at infinite dilution) would be