List of top Chemistry Questions asked in WBJEE

Which of the following statement(s) is/are correct?

pH of 10⁻⁸ M HCl solution is:

The decreasing order of reactivity of the following alkenes towards HBr addition is: \(\text{CH}_3-\text{CH}=\text{CH}_2 \, (\text{I}), \quad \text{CF}_3-\text{CH}=\text{CH}_2 \, (\text{II}), \quad \text{MeOCH}=\text{CH}_2 \, (\text{III}),\) , \((\text{IV}) \)

What will be the change in acidity if:
(i) CuSO₄ is added to saturated (NH₄)₂SO₄ solution,
(ii) SbF₅ is added to anhydrous HF?

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

The correct stability order of the following carbocations is : (I)H₂C⨁-CH=CH-CH₃, (II)⨁CH₂-CH=CH-BMe₂, (III)H₂C⨁-CH=CH-NMe₂, (IV)H₂C⨁-CH=CH-OMe

The correct order of boiling points of N-ethylethanamine(I), ethoxyethane(II) and butan-2-ol(III) is

 
'L' in the above sequence of reaction is/are(where L≠M≠N)

The correct set(s) of reactions to synthesize benzoic acid starting from benzene is/are

An electron in the 5d orbital can be represented by the following(n,1,mr) values

The conversion(s) that can be carried out by bromine in carbon tetrachloride solvent is/are

Which of the following mixtures act(s) as a buffer solution?

Which statement(s) is/are applicable above critical temperature?

 
'G' in the above sequence of reaction is

Nickel combines with a uninegative monodentate ligand (X^-) to form a paramagnetic complex [NiX4]^2-.The hybridization involved and number of unpaired electrons present in the complex and respectively

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 is

(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