JEE Main 2026 · 6 Apr 2026 Shift 2

Which of the following contain the same number of atoms? (Given : Molar mass in g mol⁻¹ of H, He, O and S are 1, 4, 16 and 32 respectively)

1. A2 g of O₂ gas
2. B4 g of SO₂ gas
3. C1400 mL of O₂ at STP
4. D0.05 L of He at STP
5. E0.0625 mol of H₂ gas Choose the correct answer from the options given below:

The Bohr radius of a hydrogen like species is 70.53 pm. The species and the stationary state (n) are respectively (Given : Hydrogen atom Bohr radius is 52.9 pm)

1. ALi²⁺, 3
2. BHe⁺, 3
3. CHe⁺, 2
4. DLi²⁺, 2

Given below are two statements: Statement I : The number of compounds among SO₂, SO₃, SF₄, SF₆ and H₂S in which sulphur does not obey the Octet rule is 3. Statement II : Among [H₂O, ClF₃, SF₄], [NH₃, BrF₅, SF₄], [BrF₅, ClF₃, XeF₄] and [XeF₄, ClF₃, H₂O], the number of sets in which all the molecules have one lone pair of electrons on the central atom is 1. In the light of the above statements, choose the correct answer from the options given below:

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

Match List - I with List - II. Given V₁ and V₂ are initial and final volumes respectively. List - I (Isothermal process)

1. AReversible expansion
2. BFree expansion
3. CIrreversible Compression
4. DCyclic reversible List - II (Expression) I. q = 0 II. q = nRT ln V₂/V₁ III. w = −Pₑₓₜ (V₁ − V₂) IV. qᵣₑᵥ/T = 0 Choose the correct answer from the options given below:

Given is a concentrated solution of a weak electrolyte AₓBᵧ, of concentration ‘c’ and dissociation constant ‘K’. The degree of dissociation is given by:

1. A[K × cˣ⁺ʸ⁻¹ xˣ yʸ]ˣ⁺ʸ
2. B(K/(cˣ⁺ʸ⁻¹ xˣ yʸ))¹/⁽ˣ⁺ʸ⁾
3. C(cˣ⁺ʸ⁻¹ xˣ yʸ/K)ˣ⁺ʸ
4. D(cˣ⁺ʸ⁻¹ xˣ yʸ/K)¹/⁽ˣ⁺ʸ⁾

In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right element, except noble gases, are respectively.

1. Alowest and lowest
2. Bhighest and lowest
3. Clowest and highest
4. Dhighest and highest

Given below are two statements: Statement I : F₂O < H₂O < Cl₂O is the correct trend in terms of bond angle. Statement II : SiF₄, SnF₄ and PbF₄ are ionic in nature. In the light of the above statements, choose the correct answer from the options given below:

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

The correct order of first (ΔᵢH₁) and second (ΔᵢH₂) ionisation enthalpy values of Cr and Mn are:

1. AΔᵢH₁ : Cr > Mn
2. BΔᵢH₂ : Cr > Mn
3. CΔᵢH₁ : Mn > Cr
4. DΔᵢH₂ : Mn > Cr Choose the correct answer from the options given below: