JEE Main 2025 (22 Jan Shift 2)

The compound with molecular formula C₆H₆, which gives only one monobromo derivative and takes up four moles of hydrogen per mole for complete hydrogenation has ________ π electrons.

20 mL of 2 M NaOH solution is added to 400 mL of 0.5 M NaOH solution. The final concentration of the solution is _______ ×10⁻² M. (Nearest integer)

Consider the following cases of standard enthalpy of reaction (ΔH°ᵣ in kJ mol⁻¹) C₂H₆(g) + 7/2 O₂(g) → 2CO₂(g) + 3H₂O(l) ΔH°₁ = −1550 C(graphite) + O₂(g) → CO₂(g) ΔH°₂ = −393.5 H₂(g) + 1/2 O₂(g) → H₂O(l) ΔH°₃ = −286 The magnitude of ΔH°f(C₂H₆(g)) is _______ kJ mol⁻¹ (Nearest integer).

Niobium (Nb) and ruthenium (Ru) have "x" and "y" number of electrons in their respective 4d orbitals. The value of x + y is ______ -.

The complex of Ni²⁺ ion and dimethyl glyoxime contains ________ number of Hydrogen (H) atoms.