Practice question

Given: A zero-order reaction has a rate constant of 2.0 × 10⁻² mol L^{-1 min^{-1 . How long will it take for 0.5 M to reduce to 0.1 M? These values define the system as per NCERT data. Formula: t = frac[R]_0 - [R]k = frac0.5 - 0.12.0 × 10⁻²= 20 min .. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Substituting values like 1.2 × 10⁻⁵, 236 J kg⁻¹ K⁻¹, CH₃CH₂NH₂ etc. into the formula and simplifying step by step. 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.