WB JEE 2025 | WB JEE Year Wise Previous Years Questions

Chemistry

1. The number of lone pair of electrons and the hybridization of Xenon ( Xe ) in $\mathrm{XeOF}_2$ are 2. In the following reaction, the major product $(\mathrm{H})$ is 3. Increasing order of the nucleophilic substitution of following compounds 4. Which of the following hydrocarbons reacts easily with $\mathrm{MeMgBr}$ to give methane? 5. Adiabatic free expansion of ideal gas must be 6. An optically active alkene having molecular formula $\mathrm{C}_8 \mathrm{H}_{16}$ gives acetone as one of the products 7. $360 \mathrm{~cm}^3$ of a hydrocarbon diffuses in 30 minutes, while under the same conditions $360 \mathrm{~cm}^3$ of $\ 8. The number of terminal and bridging hydrogens in $\mathrm{B}_2 \mathrm{H}_6$ are respectively 9. The major product (F) in the following reaction is 10. For a chemical reaction, half-life period $\left(t_{\frac{1}{2}}\right)$ is 10 minutes. How much reactant will be left a 11. Equal volume of two solutions $A$ and $B$ of a strong acid having $\mathrm{pH}=6.0$ and $\mathrm{pH}=4.0$ respectively a 12. $P$ and $Q$ combines to form two compounds $\mathrm{PQ}_2$ and $\mathrm{PQ}_3$. If $1 \mathrm{~g} ~\mathrm{PQ}{ }_2$ is 13. Identify the major product (G) in the following reaction 14. 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 15. Arrange the following compounds in order of their increasing acid strength 16. Which of the following hydrogen bonds is likely to be the weakest? 17. How many oxygen atoms are present in 0.36 g of a drop of water at STP? 18. The molar conductances of $\mathrm{Ba}(\mathrm{OH})_2, \mathrm{BaCl}_2$ and $\mathrm{NH}_4 \mathrm{Cl}$ at infinite dilu 19. The common stable oxidation states of Eu and Gd are respectively 20. Which one among the following compounds will most readily be dehydrated under acidic condition? 21. $$\begin{aligned} &{ }_5 \mathrm{~B}^{10}+{ }_2 \mathrm{He}^4 \rightarrow \mathrm{X}+{ }_0 \mathrm{n}^1\\ &\text { In th 22. An LPG (Liquified Petroleum Gas) cylinder weighs 15.0 kg when empty. When full, it weighs 30.0 kg and shows a pressure o 23. What is the four-electron reduced form of $\mathrm{O}_2$ ? 24. Kjeldahl's method cannot be used for the estimation of nitrogen in which compound? 25. Which of the following compounds is most reactive in $\mathrm{S}_{\mathrm{N}} 1$ reaction? 26. The coagulating power of electrolytes having ions $\mathrm{Na}^{+}, \mathrm{Al}^{3+}$ and $\mathrm{Ba}^{2+}$ for $\mathr 27. If three elements $A, B, C$ crystalise in a cubic solid lattice with $B$ atoms at the cubic centres, $C$ aton at the cen 28. Which of the following oxides is paramagnetic? 29. How many electrons are needed to reduce $\mathrm{N}_2$ to $\mathrm{NH}_3 ?$ 30. The bond order of $\mathrm{HeH}^{+}$is 31. 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 32. As per the following equation, 0.217 g of HgO (molecular mass $=217 \mathrm{~g} \mathrm{~mol}^{-1}$ ) reacts with excess 33. The major product 'P' and 'Q' in the above reactions are 34. Consider the following gas phase dissociation, $\mathrm{PCl}_5(\mathrm{~g}) \rightleftharpoons \mathrm{PCl}_3(\mathrm{~g 35. Compound given below will produce effervescence when mixed with aqueous sodium bicarbonate solution 36. Which of the following statement(s) is/are correct about the given compound? 37. $X$ is an extensive property and $x$ is an intensive property of a thermodynamic system. Which of the following statemen 38. Which pair of ions among the following can be separated by precipitation method? 39. The compound(s) showing optical activity is/are 40. Identify 'P' and 'Q' in the following reaction

Mathematics

1. If $f(x)=\left\{\begin{array}{ll}x^2+3 x+a, & x \leq 1 \\ b x+2, & x>1\end{array}, x \in \mathbb{R}\right.$, is everywhe 2. Let $p(x)$ be a real polynomial of least degree which has a local maximum at $x=1$ and a local minimum at $x=3$. If $p(1

Physics

1. The velocity-time graph for a body of mass 10 kg is shown in the figure. Work done on the body in the first two seconds 2. For a domestic AC supply of 220 V at 50 cycles per sec, the potential difference between the terminals of a two-pin elec 3. A radioactive nucleus decays as follows : $$ X \xrightarrow{\alpha} X_1 \xrightarrow{\beta} X_2 \xrightarrow{\alpha} X_3

Chemistry

Mathematics

Physics

WB JEE 2025

MCQ (Single Correct Answer)

-0.25

A radioactive nucleus decays as follows :

$$ X \xrightarrow{\alpha} X_1 \xrightarrow{\beta} X_2 \xrightarrow{\alpha} X_3 \xrightarrow{\gamma} X_4 $$

If the mass number and atomic number of ' $X_4$ ' are 172 and 69 respectively, then the atomic number and mass number of ' $X$ ' are

72,180

69,170

68,172

70,172

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