NEET Chemistry

In compression, volume decreases and work is done ON the gas, making w positive (in physics convention). W = -nRT ln(Vf/Vi) where Vf < Vi

Using Henderson-Hasselbalch equation: pH = pKa = -log(1.8 × 10⁻⁵) ≈ 4.74 (when [acid] = [salt])

For l = 2 (d-subshell), ml values range from -2 to +2, giving 5 orbitals

E°cell = E°cathode - E°anode = 0.34 - (-0.76) = 1.10 V

For first-order reaction: t₁/₂ = 0.693/k, so k = 0.693/69.3 = 1.0 × 10⁻³ min⁻¹

Osmotic pressure depends on solute nature because it involves membrane interactions. Other colligative properties depend only on number of solute particles

π = nRT/V = (0.1 × 0.0821 × 300)/1 = 2.463 atm

Given reaction releases 572 kJ for 2 moles of H₂. For 4 moles of H₂, heat released = (572/2) × 4 = 1144 kJ

MgO has the smallest ionic radii and highest charge density among options, leading to maximum lattice energy (~3850 kJ/mol)

For AgCl, Ksp = [Ag⁺][Cl⁻] = s². So s = √(1.8 × 10⁻¹⁰) = 1.34 × 10⁻⁵ mol/L