List of top Chemistry Questions asked in WBJEE

Which of the following have tetrahedral structures?
Which of the following statement(s) is/are correct?
1 mole of an ideal gas undergoes the following processes:
Process A \(\rightarrow\) Isothermal expansion at \(400\text{K}\) from volume \(V_1\) to volume \(V_2\), such that \(V_2 = 4V_1\).
Process B \(\rightarrow\) Adiabatic expansion from volume \(V_1\) to volume \(V_2\), such that \(V_2 = 4V_1\).
Consider the following statements and select the correct one/s.
Which of the following statement(s) is/are correct about the given compound?

The IUPAC name of the given compound is

\(\text{RO}-\text{CH}_2-\text{C} \equiv \text{CH} \xrightarrow{\text{X}} \xrightarrow{\text{Y}} \text{RO}-\text{CH}_2-\text{C} \equiv \text{C}-\text{CH}_2\text{CH}_2-\text{Br}\)
To carry out the above conversion X and Y are respectively
For the metal complex \([\text{Co}(\text{NH}_3)_5\text{SO}_4]\text{Br}\), coordination number, oxidation number, number of \(d\)-electrons and number of unpaired \(d\)-electrons are respectively
An organic compound undergoes first order decomposition. The time taken for its decomposition to \(\frac{1}{8}\text{th}\) and \(\frac{1}{10}\text{th}\) of its initial concentration are \(t_{1/8}\) and \(t_{1/10}\) respectively. The value of \(\left[ \frac{t_{1/8}}{t_{1/10}} \right]\) is [Given \(\log_{10} 2 = 0.3\)]
A \(5.0\text{ cm}^3\) solution of \(\text{H}_2\text{O}_2\) liberates \(1.27\text{ g}\) of iodine from an acidified \(\text{KI}\) solution. The percentage strength of \(\text{H}_2\text{O}_2\) is close to
Glucose is added to 1 litre of water to such an extent that \(\Delta T_f / K_f\) equals to \(\frac{1}{1000}\). The weight of glucose added is
The calculated magnetic moment for low spin $[\text{Ru}(\text{EDTA})]^-$ is

In the following reaction sequence, the product Y is

In a first order reaction, the concentration of reactant decreases from \(400\ \text{moles lit}^{-1}\) to \(50\ \text{moles lit}^{-1}\) in \(7.5\times10^{3}\ \text{s}\). The rate constant of the reaction is (approximately):
For the reaction \(\text{A} \rightleftharpoons \text{B}\), variation of concentration is plotted against time as shown below.
In which of the following species, \(\text{sp}^{3}\text{d}^{2}\) hybridisation is not associated?
Rank the following anions in order of decreasing nucleophilicity in a polar protic solvent (most $\rightarrow$ least nucleophilic).

The major product in the following reaction is
Which one of the following does not lose water even in conc. \(\text{H}_{2}\text{SO}_{4}\)?
The van der Waal's equation \(\left(P + \frac{a}{4V^2}\right)\left(V - \frac{b}{2}\right) = \frac{RT}{2}\) is valid for:
The products X and Y in the following reaction sequence are

The increasing order of basicity of the following compounds is

Borazole is prepared by heating the product isolated by reacting
The correct order of conductivity of 0.001 (M) separate aqueous solutions of \([\text{Pt}(\text{NH}_3)_6]\text{Cl}_4\) (i); \([\text{Cr}(\text{NH}_3)_6]\text{Cl}_3\) (ii); \([\text{Co}(\text{NH}_3)_4\text{Cl}_2]\text{Cl}\) (iii) and \(\text{K}_2\text{PtCl}_6\) (iv) each containing octahedral complex species is
A buffer solution contains 100ml of 0.01(M) \(\text{CH}_3\text{COOH}\) and 200ml of 0.02(M) \(\text{CH}_3\text{COONa}\). 700ml of water is added subsequently to the buffer solution. The pH before and after dilution are [given, \(\text{p}K_a = 4.74\); \(\log 2 = 0.301\)]
The plot of radial probability density ($4\pi r^2 R^2$) against $r$ for an electron in $np$ orbital of a many electron atom is given below. The value of $n$ is