Practice question

Given: How many moles of electrons are required to reduce 1 mol of Cr³⁺ to Cr(s)? These values define the system as per NCERT data. Formula: Reaction: Cr³+ + 3e- -> Cr(s). This is the standard NCERT relation for this phenomenon. Substitution & Calculation: 3 moles of electrons are required per mole of Cr³⁺. 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.