Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2003ChemistryChemical KineticsActual

The radiosotope tritium ( ₁^3 H ) has a lalf life of 12.3 years. If the initial amount of tritium is 32 mg , how many milligrams of it would remain after 49.2 years

Options

  1. A1 mg
  2. B2 mg
  3. C4 mg
  4. D8 mg

Correct answer

B. 2 mg

Step-by-step solution

aligned T & = t ^ 1 / 2 n n & = 49.2 12.3 =4 ~N & = N ₀(1 / 2)^n & =32(1 / 2)^4 & =2 mg aligned

Practice Chemical Kinetics on Quantrex Academy →

More from Chemical Kinetics

The combination of NO ₂(g) and CO (g) occurs in two steps as follows: What is the rate law for the reaction? 2 NO ₂ NO + NO ₃(k₁) - slow NO ₃ + CO CO ₂ + NO ₂(k₂) - fast 2026The slope of the graph [ A ]_t against time for zero order reaction is 2026For the reaction C ₂ H ₅ Br _ (l) C ₂ H _ 4(g) + HBr , r = K( C ₂ H ₅ Br ) What is order and molecularity of the reaction respectively ? 2026The decomposition of N ₂ O _ 5(g) occurs as: 2 N ₂ O _ 5(g) 4 NO _ 2(g) + O _ 2(g) . If initial concentration of N ₂ O _ 5(g) is 1.63 10⁻² mol L ⁻¹ and after 400 seconds it is 1.36 2026Which of the following statements represents rate of reaction? 2026What is the order of reaction for the following? 2 H ₂ O ₂(l) 2 H ₂ O (l) + O ₂(g) 20262 A k B is a zero-order reaction, where k=1.0 mol L ⁻¹ min ⁻¹ . If the initial concentration of A is 2 M, then the time taken to complete 75 % of the reaction will be 2026Match List I with List II : List I (Order of reaction) List II (Unit of rate constant) A. Zero order I. mol ⁻¹ L s ⁻¹ B. First order II. mol ⁻² L ² s ⁻¹ C. Second order III. s ⁻¹ D 2026 Full Chemical Kinetics list All NEET PYQs