JEE Main 2026 · 6 Apr 2026 Shift 1

An oxide of iron contains 69.9% iron, its empirical formula, is: (Given : Molar mass of Fe and O are 56 and 16 g mol⁻¹ respectively.)

1. AFeO
2. BFe₂O₃
3. CFe₃O₄
4. DFeO₃

If shortest wavelength of hydrogen atom in Lyman series is x, then longest wavelength in Balmer series of He⁺ is:

1. A9x/5
2. B36x/5
3. Cx/4
4. D5x/9

The pairs among A = [SO₃²⁻, CO₃²⁻], B = [O₂²⁻, F₂], C = [CN⁻, CO], D = [NH₃, H₃O⁺] and E = [MnO₄²⁻, CrO₄²⁻] that do not have similar Lewis dot structure are

1. AA, B and E
2. BA and E
3. CB, C and D
4. DC and D

Arrange the following isothermal processes in order of the magnitude of the work (p − V) involved between states 1 and 2.

1. AExpansion in single stage w_A
2. BExpansion in multi stages w_B
3. CCompression in single stage w_C
4. DCompression in multi stages w_D. Choose the correct option:

When 0.25 moles of a non-volatile, non-ionizable solute was dissolved in 1 mole of a solvent the vapor pressure of solution was x % of vapor pressure of pure solvent. What is x %?

1. A50%
2. B60%
3. C70%
4. D80%

One mole each of He and A(g) are taken in a 10 L closed flask and heated to 400 K to establish the following equilibrium. A(g) ⇌ B(g). K_c for this reaction at 400 K is 4.0. The partial pressures (in atm) of He and B(g) are respectively (at equilibrium) (Assume He, A(g) and B(g) behave as ideal gases) (Given : R = 0.082 L atm K⁻¹ mol⁻¹)

1. A3.28, 2.624
2. B2.624, 3.28
3. C3.28, 0.656
4. D0.656, 6.56

Given below are two statements: Statement I: Aluminium is more electropositive than thallium as the standard electrode potential value of E° Al³⁺/Al is negative and E° Tl³⁺/Tl is positive. Statement II: The sum of first three ionization enthalpies of boron is very high when compared to that of aluminium. Due to this reason boron forms covalent compounds only and aluminium forms Al³⁺ ion. 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 statements among the following are.

1. ABasic vanadium oxide is used in the manufacture of H₂SO₄.
2. BThe spin-only magnetic moment value of the transition metal halide employed in Ziegler-Natta polymerization is 2.84 BM.
3. CThe p-block metal compound employed in Ziegler-Natta polymerization has the metal in +3 oxidation state.
4. DThe number of electrons present in the outer most 'd' orbital of metal halide employed in Wacker process is 8. Choose the correct answer from the options given below: