2. Solved Papers
  3. BCECE Engineering

BCECE Engineering BCECE Engineering Solved Paper-2002

  • question_answer
    What is the rate of a reaction in a first order reaction, if its half life period is 693 s and its concentration is\[\text{2 mol/L}\]?

    A) 100                        

    B)        0.002

    C) 0.02                       

    D)        200

    Correct Answer: B

    Solution :

    Key Idea: (i) \[k=\frac{0.693}{{{t}_{1/2}}}\] (ii) For first order reaction r = k [cone. Of reactant] Given \[{{t}_{1/2}}=693\,s,\]  [conc. of reactants] = 2 mol/L                 \[\therefore \]  \[k=\frac{0.693}{{{t}_{1/2}}}=\frac{0.693}{693}={{10}^{-3}}\]                                 \[r={{10}^{-3}}\times 2\]                                 \[=2\times {{10}^{-3}}=0.002\]


You need to login to perform this action.
You will be redirected in 3 sec spinner