WB JEE 2025

Which one among the following compounds will most readily be dehydrated under acidic condition?

The major product 'P' and 'Q' in the above reactions are

The major product (F) in the following reaction is

Identify the major product (G) in the following reaction

Compound given below will produce effervescence when mixed with aqueous sodium bicarbonate solution

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

Which of the following hydrogen bonds is likely to be the weakest?

Which of the following oxides is paramagnetic?

The bond order of $\mathrm{HeH}^{+}$is

Consider the following gas phase dissociation, $\mathrm{PCl}_5(\mathrm{~g}) \rightleftharpoons \mathrm{PCl}_3(\mathrm{~g})+\mathrm{Cl}_2(\mathrm{~g})$ with equilibrium constant $K_P$ at a particular temperature and at pressure $P$. The degr...

For a chemical reaction, half-life period $\left(t_{\frac{1}{2}}\right)$ is 10 minutes. How much reactant will be left after 20 minutes if one starts with 100 moles of reactant and the order of the reaction be (i) zero, (ii) one and (iii) t...

An egg takes 4.0 minutes to boil at sea level where the boiling point of water is $T_1 K$, where as it takes 8.0 minutes to boil on a mountain top where the boiling point of water is $\mathrm{T}_2 \mathrm{~K}$. The activation energy for the...

Identify 'P' and 'Q' in the following reaction

The common stable oxidation states of Eu and Gd are respectively

The molar conductances of $\mathrm{Ba}(\mathrm{OH})_2, \mathrm{BaCl}_2$ and $\mathrm{NH}_4 \mathrm{Cl}$ at infinite dilution are $523 \cdot 28,280 \cdot 0$ and $129.8 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$ respectively. The molar co...

$360 \mathrm{~cm}^3$ of a hydrocarbon diffuses in 30 minutes, while under the same conditions $360 \mathrm{~cm}^3$ of $\mathrm{SO}_2$ gas diffuses in one hour. The molecular formula of the hydrocarbon is

An LPG (Liquified Petroleum Gas) cylinder weighs 15.0 kg when empty. When full, it weighs 30.0 kg and shows a pressure of 3.0 atm . In the course of usage at $27^{\circ} \mathrm{C}$, the mass of the full cylinder is reduced to $24 \cdot 2 \...

Adiabatic free expansion of ideal gas must be

Arrange the following compounds in order of their increasing acid strength

Increasing order of the nucleophilic substitution of following compounds

Which of the following compounds is most reactive in $\mathrm{S}_{\mathrm{N}} 1$ reaction?

In the following reaction, the major product $(\mathrm{H})$ is

An optically active alkene having molecular formula $\mathrm{C}_8 \mathrm{H}_{16}$ gives acetone as one of the products on ozonolysis. The structure of the alkene is

Which of the following hydrocarbons reacts easily with $\mathrm{MeMgBr}$ to give methane?

Increasing order of solubility of AgCl in (i) $\mathrm{H}_2 \mathrm{O}$, (ii) 1 M NaCl (aq.), (iii) 1 M CaCl 2 (aq.) and (iv) $1 \mathrm{M}~ \mathrm{NaNO}_3$ (aq.) solution

Which pair of ions among the following can be separated by precipitation method?

Equal volume of two solutions $A$ and $B$ of a strong acid having $\mathrm{pH}=6.0$ and $\mathrm{pH}=4.0$ respectively are mixed together to form a new solution. The pH of the new solution will be in the range

As per the following equation, 0.217 g of HgO (molecular mass $=217 \mathrm{~g} \mathrm{~mol}^{-1}$ ) reacts with excess iodide. On titration of the resulting solution, how many mL of 0.01 M HCl is required to reach the equivalence point?
$...

The compound(s) showing optical activity is/are

$P$ and $Q$ combines to form two compounds $\mathrm{PQ}_2$ and $\mathrm{PQ}_3$. If $1 \mathrm{~g} ~\mathrm{PQ}{ }_2$ is dissolved in 51 g benzene the depression of freezing point becomes $0 \cdot 8^{\circ} \mathrm{C}$. On the other hand if ...

Kjeldahl's method cannot be used for the estimation of nitrogen in which compound?

$$\begin{aligned} &{ }_5 \mathrm{~B}^{10}+{ }_2 \mathrm{He}^4 \rightarrow \mathrm{X}+{ }_0 \mathrm{n}^1\\\\ &\text { In the above nuclear reaction ' } X \text { ' will be } \end{aligned}$$

How many electrons are needed to reduce $\mathrm{N}_2$ to $\mathrm{NH}_3 ?$

What is the four-electron reduced form of $\mathrm{O}_2$ ?

If three elements $A, B, C$ crystalise in a cubic solid lattice with $B$ atoms at the cubic centres, $C$ aton at the centre of edges and A atoms at the corners, then formula of the compound is

How many oxygen atoms are present in 0.36 g of a drop of water at STP?

The number of terminal and bridging hydrogens in $\mathrm{B}_2 \mathrm{H}_6$ are respectively

The number of lone pair of electrons and the hybridization of Xenon ( Xe ) in $\mathrm{XeOF}_2$ are

The coagulating power of electrolytes having ions $\mathrm{Na}^{+}, \mathrm{Al}^{3+}$ and $\mathrm{Ba}^{2+}$ for $\mathrm{As}_2 \mathrm{S}_3$ sol increases in the order

$X$ is an extensive property and $x$ is an intensive property of a thermodynamic system. Which of the following statement(s) is (are) correct?