JEE Main 2025 · 7 Apr 2025 Shift 2

The extra stability of half-filled subshell is due to :

1. ASymmetrical distribution of electrons
2. BSmaller coulombic repulsion energy
3. CThe presence of electrons with the same spin in non-degenerate orbitals
4. DLarger exchange energy
5. ERelatively smaller shielding of electrons by one another Identify the correct statements :

The correct statement amongst the following is :

1. AThe term ‘standard state’ implies that the temperature is 0°C.
2. BThe standard state of a pure gas is the pure gas at a pressure of 1 bar and temperature 273 K.
3. CΔfH°₂₉₈ is zero for O(g)
4. DΔfH°₅₀₀ is zero for O₂(g)

The hydration energies of K⁺ and Cl⁻ are −x and −y kJ/mol respectively. If lattice energy of KCl is −z kJ/mol, then the heat of solution of KCl is :

1. Ax + y + z
2. B+ x − y − z
3. C− z − (x + y)
4. Dz − (x + y)

Liquid A and B form an ideal solution. The vapour pressures of pure liquids A and B are 350 and 750 mm Hg respectively at the same temperature. If xₐ and xᵦ are the mole fraction of A and B in solution while yₐ and yᵦ are the mole fraction of A and B in vapour phase then,

1. Axₐ/xᵦ > yₐ/yᵦ
2. Bxₐ/xᵦ = yₐ/yᵦ
3. C(xₐ − yₐ) < (xᵦ − yᵦ)
4. Dxₐ/xᵦ < yₐ/yᵦ

Given below are two statements : 1 M aqueous solutions of each of Cu(NO₃)₂, AgNO₃, Hg₂(NO₃)₂; Mg(NO₃)₂ are electrolysed using inert electrodes. Given : E°Ag⁺/Ag = 0.80 V, E°Hg₂²⁺/Hg = 0.79 V, E°Cu²⁺/Cu = 0.24 V and E°Mg²⁺/Mg = −2.37 V. Statement (I) : With increasing voltage, the sequence of deposition of metals on the cathode will be Ag, Hg and Cu. Statement (II) : Magnesium will not be deposited at cathode instead oxygen gas will be evolved at the cathode. In the light of the above statements, choose the most appropriate answer from the options given below :

1. ABoth Statement I and Statement II are correct
2. BBoth Statement I and Statement II are incorrect
3. CStatement I is correct but Statement II is incorrect
4. DStatement I is incorrect but Statement II is correct

In SO₂, NO₂⁻ and N₃⁻ the hybridizations at the central atom are respectively :

1. Asp², sp and sp
2. Bsp, sp² and sp
3. Csp², sp² and sp
4. Dsp², sp² and sp²

Choose the incorrect trend in the atomic radii (r) of the elements.

1. ArAt < rCs
2. BrMg < rAl
3. CrRb < rCs
4. DrBr < rK

The correct statements from the following are:

1. ATl³⁺ is a powerful oxidising agent
2. BAl³⁺ does not get reduced easily
3. CBoth Al³⁺ and Tl³⁺ are very stable in solution
4. DTl⁺ is more stable than Tl³⁺
5. EAl³⁺ and Tl⁺ are highly stable Choose the correct answer from the options given below: