If the reaction- A - B - C - D is known to be zero order- what is the expression for its rate law-

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Standard XII

Chemistry

Rate of Reaction

If the reacti...

Question

If the reaction: $A + B \to C + D$ is known to be zero order, what is the expression for its rate law?

R a t e = k [A] [B]^{2}

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R a t e = k [A]^{x} [B]^{y}

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R a t e = k [A] [B]

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R a t e = k

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Solution

The correct option is D $R a t e = k$
For a reaction to being of zero-order, rate should be independent of the concentration of reactants
$∴$ Rate= $k$
$= r a t e c o n s t a n t$ .

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What is the rate law for a second order reaction: 2A → Products

Q. For the reaction

2 A + B \to C

, the values of initial rate at different reactant concentrations are given in the table below: The rate law for the reaction is:

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0.05	0.05	0.045
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In a reaction, $A + B \to$ Product, rate is doubled when the concentration of B is doubled and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled. Rate law for the reaction can be written as :

A + B \to C + D

Rate law for the given reaction is given as

k [A] [B]

.
If B is taken in excess then the rate of reaction will become:
Here,

k

is the rate constant.

k^{'} = k [B]

A reaction : $A_{2} + B \to$ Products, involves the following mechanism :
$A_{2} ⇌ 2 A (f a s t)$ (A being the intermediate)
$A + B \to k_{2} (s l o w)$ .The rate law consistent to this mechanism is :

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If the reaction: A+B→C+D is known to be zero order, what is the expression for its rate law?

The correct option is D Rate=kFor a reaction to being of zero-order, rate should be independent of the concentration of reactants∴ Rate=k=rate constant.

If the reaction: $A + B \to C + D$ is known to be zero order, what is the expression for its rate law?

The correct option is D $R a t e = k$
For a reaction to being of zero-order, rate should be independent of the concentration of reactants
$∴$ Rate= $k$
$= r a t e c o n s t a n t$ .