Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2016ChemistryChemical KineticsActual

The decomposition of phosphine P H 3 on tungsten at low pressure is a first-order reaction. It is because the

Options

  1. Arate is proportional to the surface coverage.
  2. Brate is inversely proportional to the surface coverage.
  3. Crate is independent of the surface coverage.
  4. Drate of decomposition is very slow.

Correct answer

A. rate is proportional to the surface coverage.

Step-by-step solution

The rate is proportional to the surface coverage. When pressure is so low that αp < < 1 , Rate = k r αp 1 + αp ≈ k r αp .

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