Practice question

Given: What is the mass of nickel deposited at the cathode when a 5 A current flows through Ni(NO₃)₂ solution for 20 minutes? (Molar mass of Ni = 58.7 g/mol, F = 96500 C/mol) These values define the system as per NCERT data. Formula: Q = 5 × 1200 = 6000 C. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: For Ni²⁺ + 2e⁻ → Ni(s), 2F (193000 C) deposits 58.7 g. Mass = 58.7 × 6000/193000 approx 1.824 g . 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.