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MHT CET20228 Aug 2022Morning ShiftChemistryChemical KineticsActual

Which of the following is an example of first order reaction?

Options

  1. A2 NH ₃( ~g ) N ₂( ~g )+3 H ₂( ~g )
  2. B2 H ₂ O ( l ) 2 H ₂ O ( l )+ O ₂( ~g )
  3. C4 PH ₃ W P ₄+6 H ₂( ~g )
  4. D2 ~N ₂ O ( g ) Pt 2 ~N ₂( ~g )+ O ₂( ~g )

Correct answer

D. 2 ~N ₂ O ( g ) Pt 2 ~N ₂( ~g )+ O ₂( ~g )

Step-by-step solution

Reaction order is an experimentally determined quantity describing how rate depends on reactant concentrations. A first-order reaction exhibits a rate linearly dependent on a single reactant concentration, or one where the sum of concentration exponents in the rate law equals one. Considering each option: A) CH ₃ CHO _ ( g ) CH _ 4( ~g ) + CO _ ( g ) : Acetaldehyde decomposition may follow first-order kinetics at high temperatures but exhibits complex behavior and is not universally first-order. B) 2 NO _ 2( ~g ) +

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