JEE Main 2025 (24 Jan Shift 1)

The carbohydrate 'Ribose' present in DNA, is A. A pentose sugar B. present in pyranose from C. in 'D' configuration D. a reducing sugar, when free E. in $\alpha$-anomeric form. Choose the correct answer from the options given below:

Which of the following arrangements with respect to their reactivity in nucleophilic addition reaction is correct?

Let us consider an endothermic reaction which is non-spontaneous at the freezing point of water. However, the reaction is spontaneous at boiling point of water. Choose the correct option.

Preparation of potassium permanganate from $\text{MnO}_2$ involves two step process in which the 1st step is a reaction with KOH and $\text{KNO}_3$ to produce

For a reaction, $\text{N}_2\text{O}_{5(g)}\to2\text{NO}_{2(g)}+\frac12\text{O}_{2(g)}$ in a constant volume container, no products were present initially. The final pressure of the system when $50\%$ of reaction gets completed is

One mole of the octahedral complex compound $\text{Co(NH}_3)_5\text{Cl}_3$ gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with excess of $\text{AgNO}_3$ solution to yield two moles of $\text{AgCl}_{(s)}$. The structure of the complex is:

Which of the following ions is the strongest oxidizing agent? (Atomic Number of Ce = 58, Eu = 63, Tb = 65, Lu = 71)

$K_{sp}$ for $\text{Cr(OH)}_3$ is $1.6\times10^{-30}$. What is the molar solubility of this salt in water?

Which of the following statements are NOT true about the periodic table? A. The properties of elements are function of atomic weights. B. The properties of elements are function of atomic numbers. C. Elements having similar outer electronic configurations are arranged in same period. D. An element's location reflects the quantum numbers of the last filled orbital. E. The number of elements in a period is same as the number of atomic orbitals available in energy level that is being filled. Choose the correct answer from the options given below:

Given below are two statements I and II. Statement I: Dumas method is used for estimation of 'Nitrogen' in an organic compound. Statement II: Dumas method involves the formation of ammonium sulphate by heating the organic compound with conc $\text{H}_2\text{SO}_4$. In the light of the above statements, choose the correct answer from the options given below

Which of the following statement is true with respect to $\text{H}_2\text{O},\text{NH}_3$ and $\text{CH}_4$? A. The central atoms of all the molecules are $sp^3$ hybridized. B. The $\text{H-O-H},\text{H-N-H}$ and $\text{H-C-H}$ angles in the above molecules are $104.5^\circ,107.5^\circ$ and $109.5^\circ$, respectively. C. The increasing order of dipole moment is $\text{CH}_4<\text{NH}_3<\text{H}_2\text{O}$. D. Both $\text{H}_2\text{O}$ and $\text{NH}_3$ are Lewis acids and $\text{CH}_4$ is a Lewis base. E. A solution of $\text{NH}_3$ in $\text{H}_2\text{O}$ is basic. In this solution $\text{NH}_3$ and $\text{H}_2\text{O}$ act as Lowry-Bronsted acid and base respectively. Choose the correct answer from the options given below:

Which one of the carbocations from the following is most stable?

For the given cell $\text{Fe}^{2+}_{(aq)}+\text{Ag}^+_{(aq)}\to\text{Fe}^{3+}_{(aq)}+\text{Ag}_{(s)}$ The standard cell potential of the reaction is. Given: $\text{Ag}^++e^-\to\text{Ag}$ $E^\theta=xV$; $\text{Fe}^{2+}+2e^-\to\text{Fe}$ $E^\theta=yV$; $\text{Fe}^{3+}+3e^-\to\text{Fe}$ $E^\theta=zV$

The large difference between the melting and boiling points of oxygen and sulphur may be explained on the basis of

Consider the given plots of vapour pressure (VP) vs temperature (T/K). Which amongst the following options is correct graphical representation showing $\Delta T_f$, depression in the freezing point of a solvent in a solution?

Which of the following linear combination of atomic orbitals will lead to formation of molecular orbitals in homonuclear diatomic molecules [internuclear axis in $z$-direction]? A. $2p_z$ and $2p_x$ B. $2s$ and $2p_x$ C. $3d_{xy}$ and $3d_{x^2-y^2}$ D. $2s$ and $2p_z$ E. $2p_z$ and $3d_{x^2-y^2}$ Choose the correct answer from the options given below: