JEE Main 2026 · 2 Apr 2026 Shift 1

The mass of iron converted into Fe₃O₄ by the action of 18 g of steam is : (Given : Molar mass of H, O and Fe are 1, 16 and 56 g mol⁻¹ respectively) Assume iron is present in excess :

1. A2.1 g
2. B4.2 g
3. C21 g
4. D42 g

What is the energy (in J atom⁻¹) required for the following process? Li²⁺(g) → Li³⁺(g) + e⁻ (Take the ionization energy for the H atom in the ground state as 2.18 × 10⁻¹⁸ J atom⁻¹)

1. A8.72 × 10⁻¹⁸
2. B1.962 × 10⁻¹⁸
3. C1.962 × 10⁻¹⁷
4. D6.54 × 10⁻¹⁷

Given below are two statements : Statement (I) : The correct sequence of bond lengths in the following species is : O₂⁺ < O₂ < O₂⁻ < O₂²⁻ Statement (II) : The correct sequence of number of unpaired electrons in the following species is : O₂ > O₂⁺ > O₂⁻ > O₂²⁻ 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

Consider the following data.

1. (i)
   2Al(s) + 6HCl(aq) → Al₂Cl₆(aq) + 3H₂(g) + 1200 kJ/mol
2. (ii)
   H₂(g) + Cl₂(g) → 2HCl(g) + 164 kJ/mol
3. (iii)
   HCl(g) + aq → HCl(aq) + 83 kJ/mol
4. (iv)
   Al₂Cl₆(s) + aq → Al₂Cl₆(aq) + 663 kJ/mol The enthalpy of formation of anhydrous solid Al₂Cl₆ is :

19.5 g of fluoro acetic acid (molar mass = 78 g mol⁻¹) is dissolved in 500 g of water at 298 K. The depression in the freezing point of water was 1°C. What is Kₐ of fluoro acetic acid ? (For water, Kf = 1.86 K kg mol⁻¹). Assume molarity and molality to have same values.

1. A10⁻⁶
2. B4 × 10⁻⁴
3. C3 × 10⁻⁵
4. D3 × 10⁻³

The solubility product constants of Ag₂CrO₄ and AgBr are 32x and 4y respectively at 298 K. The value of (molarity of Ag₂CrO₄ / molarity of AgBr) can be expressed as :

1. A2∛x/y
2. B2√(x/y)
3. C√(x/y)
4. D∛x/√y

An electrochemical cell is constructed using half cells in the direction of spontaneous change Fe(OH)₂(s) + 2e⁻ → Fe(s) + 2OH⁻(aq) E° = −0.88 V and AgBr(s) + e⁻ → Ag(s) + Br⁻(aq) E° = +0.07 V Which of the following option is correct ?

1. AOverall reaction Fe(s) + 2OH⁻(aq) + 2AgBr(s) ⇌ Fe(OH)₂(s) + 2Ag(s) + 2Br⁻(aq)
2. BE°cell = −0.95 V
3. CFe is reduced in the electrochemical cell
4. DE°cell is an extensive property

Given below are two statements : Statement (I) : The first ionisation enthalpy of the elements Na, Mg, Cl and Ar follows the order Na > Mg > Cl > Ar. Statement (II) : Among Ca, Al, Fe and B, the third ionisation enthalpy is very high for Ca. 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