List of top Questions asked in KCET, WBJEE

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

A compound contains two types of atoms $A$ and $B$. Its crystal structure is a cubic lattice with '$A$' atoms at the corner of the unit cells and '$B$' atoms at the body centres. The simplest formula of the compound will be
Which one of the following cations gives a chocolate brown precipitate upon addition of aqueous solution of \(\text{K}_4[\text{Fe}(\text{CN})_6]\)?
How many isomers can a compound with molecular formula \( \text{C}_3\text{H}_5\text{Br} \) have?
Peroxide ion is
Which of the following is the structure of pyrosulphuric acid?
The van’t Hoff Factor (i) for a dilute aqueous solution of \( \text{Na}_2\text{SO}_4 \) is
Indicate the major product of the following reaction:

\

In a conductance experiment, aqueous \( \text{AgNO}_3 \) solution is added to aqueous \( \text{KCl} \) solution gradually and simultaneously the molar conductivity (\( \lambda_m \)) is measured. The correct plot of \( \lambda_m \) versus volume of \( \text{AgNO}_3 \) solution is
Three engines A, B and C take steam at \( 130^\circ\text{C} \) and reject it at \( 20^\circ\text{C} \), \( 40^\circ\text{C} \) and \( 50^\circ\text{C} \) respectively. The most efficient engine will be
A compound (X) when treated with \( \text{CuSO}_4 \) solution yields a brown precipitate. On adding hypo solution the precipitate turns white. The compound (X) is
In the following sequence of reactions, what is the end product 'Z'?
Among \( \text{N}_2\text{O} \), \( \text{ClF}_2^- \), \( \text{SO}_2 \) and \( \text{I}_3^+ \), the species having the linear structures are
The major products U and V in the following reaction are