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Most Important Selected Qs for JEE AdvancedChemistryChemical Kinetics

A reactant dissociates into different products in concurrent elementary reactions as given below aligned & P ~K ₁ 2 Q, ~K ₁=15 10⁻² & 3 P ~K ₂ 4 R , ~K ₂=5 10⁻² & nP ~K ₃ 3 ~S , ~K ₃=7.5 10⁻² aligned The value of K ₁, ~K ₂ and K ₃ given are magnitude only. If the initial rate of disappearance of ' P ' when the pressure of P is 1 atm is 0.45 ~atm sec the value of n is

Options

  1. A4
  2. B3
  3. C2
  4. DCannot be determined

Correct answer

C. 2

Step-by-step solution

- dP dt = K ₁[ P ]+3 ~K ₂[ P ]^3+ nK ₃[ P ]^n aligned = & (15 10⁻²+15 10⁻²+ n (7.5) 10⁻² ) = & (30+7.5 n ) 10⁻² & 30+7.5 n =45 & n=2 aligned

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