Practice question

Given: How much charge in coulombs is required to reduce 1 mol of Al³⁺ to Al? These values define the system as per NCERT data. Formula: Charge = 3 × F = 3 × 96500 = 289500 C .. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Reaction: Al³⁺ + 3e⁻ → Al(s), 3 moles of electrons per mole of Al. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.