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Chemical Kinetics 2 Mark Creative Question Paper With Answer Key

12th Standard

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 30

    2 Marks

    15 x 2 = 30
  1. What is the study of chemical kinetics used for?

  2. For a reaction A + B ⟶ C, the rate of the reaction is denoted \(\frac { -dA }{ dt } \) or \(\frac { -dB }{ dt } \) or \(\frac { +dC }{ dt } \). State the significance of plus and minus sign.

  3. Rate of chemical reaction is not uniform throughout. Justify you answer:

  4. H2(g) + Cl2(g) \(\overset { hv }{ \longrightarrow } \) 2HCl(g). The reaction proceeds with a uniform rate throughout. What do you conclude? 

  5. Why is instantaneous rate preferred over average rate?

  6. For a chemical reaction, Variation in the concentration In[A] Vs time in seconds is given as

    (i) What is the order of the reaction?
    (ii) What is the unit of rate constant K?
    (iii) Give the relationship between k and \({ t }_{ \frac { 1 }{ 2 } }\)

  7. The decomposition reaction of ammonia gas on platinum surface has a rate constant R = 2.5 x 10-4mol L-1. What is the order of the reaction.

  8. The reaction A + 2B ⟶ C obeys the rate equation. Rate = \(K{ \left[ A \right] }^{ \frac { 1 }{ 2 } }{ \left[ B \right] }^{ \frac { 3 }{ 2 } }\) What is the order of the reaction?

  9. For the reaction Cl2 (g) + 2NO (g) ⟶ 2NOCI(g)
    The rate law is expressed as rate = K[Cl2] [NO]2
    What is the overall order of this reaction?

  10. How does the value of rate constant vary with reactant constant.

  11. Why does the rate of any reaction genergally decreases during the course of the reaction?

  12. Answer the following:
    (i) Effect the adding catalyst on activation energy and Gibb's energy (ΔG).
    (ii) Why do we heat the solution of oxalic acid in redox tetration against KMnO4?

  13. Write the units of zeroth, first, second and third order rate constants.

  14. A first order reaction has a specific reaction rate of 10-3 S-1. How much time will it take for 10gm of the reactant to reduce to 2.5 gm?

  15. If the rate of a reaction gets doubled as the temperature is increased from 27oC to 37oC. Find the activation energy of reaction?

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