JEE Main 2026 · 4 Apr 2026 Shift 1

Number of moles and number of molecules in 1.4187 L of SO₂ at STP respectively are

1. A0.1266; 3.812 × 10²²
2. B0.0633; 3.812 × 10²²
3. C0.1266; 7.6238 × 10²²
4. D0.0633; 7.6238 × 10²²

What is the ratio of wave number of first line (lowest energy line) of Balmer series of H atomic spectrum to first line of its Brackett series?

1. A5:1
2. B5:0.81
3. C5:1.75
4. D5:27

Which of the following is correct set of 4 quantum numbers of 19ᵗʰ electron in Chromium (Atomic number = 24) in accordance with Aufbau principle?

1. An = 3, l = 2, m = +2, s = +1/2
2. Bn = 3, l = 2, m = −2, s = +1/2
3. Cn = 4, l = 1, m = 0, s = +1/2
4. Dn = 4, l = 0, m = 0, s = +1/2

Given below are two statements: Statement I: For an ideal gas, heat capacity at constant volume is always greater than the heat capacity at constant pressure. Statement II: In a constant volume process, no work is produced and all the heat withdrawn goes into the chaotic motion and is reflected by a temperature increase of the ideal gas. 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

At T(K), the equilibrium constant of A₂(g) + B₂(g) ⇌ C(g) is 2.7 × 10⁻⁵. What is the equilibrium constant for 1/3 A₂(g) + 1/3 B₂(g) ⇌ 1/3 C(g) at the same temperature?

1. A(2.7 × 10⁻⁵)³
2. B6 × 10⁻²
3. C√(2.7 × 10⁻⁵)
4. D3 × 10⁻²

In order to oxidise a mixture of 1 mole each of FeC₂O₄, Fe₂(C₂O₄)₃, FeSO₄ and Fe₂(SO₄)₃ in acidic medium, the number of moles of KMnO₄ required is

1. A3
2. B2
3. C5
4. D7

Consider the first order reaction R → P. The fraction of molecules decomposed in the given first order reaction can be expressed as

1. A1 − eᵏ¹ᵗ
2. B1 + eᵏ¹ᵗ
3. C1 + e⁻ᵏ¹ᵗ
4. D1 − e⁻ᵏ¹ᵗ

A monoatomic anion (A⁻) has 45 neutrons and 36 electrons. Atomic mass, group in the periodic table and physical state at room temperature of the element (A) respectively are

1. A80, 17, liquid
2. B81, 16, solid
3. C80, 16, gas
4. D81, 15, gas