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For a chemical reaction A rarr Products,...

For a chemical reaction `A rarr` Products, the rate of disappearance of `A` is given by:
`-(dC_(A))/(dt)=(K_(1)C_(A))/(1+K_(2)C_(A))` At low `C_(A)`, the reaction is of the …. Order with rate constant …..: `("Assume" K_(1), K_(2) "are lesser than" 1)`

A

`I, (K_(1))/(K_(2))`

B

`I, K_(1)`

C

`II, (K_(1))/(K_(2))`

D

`II, (K_(1))/(K_(1)+K_(2))`

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • For the chemical reaction A to products, the rate of disappearance of A is given by : -r_A=-(dC_A)/(dt)=k_1C_A//(1+k_2 C_A) At low C_A the reaction is of the first order with rate constant:

    A
    `k_1//k_2`
    B
    `k_1`
    C
    `k_1,k_2`
    D
    `k_1//(k_1+k_2)`

  • The rate of reaction ((dx)/(dt)) varies with nature, physical state and concentration of reactants, temperature, exposure to light and catalyst, whereas rate constant (K) varies with temperature and catalyst only. The rate constant K is given as K=Ae^(-E_(a)//RT) where A is Arrhenius parameter or pre-exponential factor and E_(a) is energy of activation. The minimum energy required for a reaction is called threshold energy and the additional energy required by reactant molecules to attain threshold energy level is called energy of activation. For a chemical reaction: Ararr Product, the rate of disappearance of A is given by: (-dC_(A))/(dt)=K_(1) (C_(A))/(1+K_(2)C_(A)) . At low C_(A) , the order of reaction and rate constants are respectively:

    A
    (a) `I, K_(1)/K_(2)`
    B
    (b) `I, K_(1)`
    C
    (c ) `II, K_(1)/K_(2)`
    D
    (d) `II, K_(1)/(K_(1)+K_(2))`

  • The rate of the reaction A+B+C to Product is given by: rate =-(d[A])/(dt)=k[A]^(1//2) [B]^(1//4) [C]^0 The order of reaction is:

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    `1//2`
    B
    4
    C
    `3//4`
    D
    `3//2`

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