Question

1.
The order of a reaction whose rate is determined by only one concentration variable is
a) zero
b) one
c) two
d) three
​

Answer 1

First-order reaction rates are determined by one concentration variable.

• "A Chemical reaction in which the rate of reaction is directly proportional to the concentration of the reacting substance".
• In the first-order reactions, there may be multiple reactants present, but only one reactant will be of first-order concentration while the rest of the reactants would be of zero-order concentration.
• Example of a first-order reaction: $2H2O2 - > 2H2O + O$

Hence, they only depend on the concentration of the variables.

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Answer 2

Answer:

The relationship between the rate of a chemical reaction and the concentration of the species involved is referred to as the order of the reaction.

Explanation:

A first-order reaction is one whose rates are determined by the concentration of only one reactant. As a result, the reaction order is 1.

These reactions may involve a large number of reactants, but only one will be concentrated at a first-order level while the rest will be at a zero-order level.

A first-order reaction may look like this:

                   2H₂O₂ → 2H₂O + O₂

The rate of reaction in which reactions are independent of the concentration of the reactants is known as zero order reaction.

In a pseudo-first-order reaction, one component's concentration stays constant.

A reaction is referred to be a second-order reaction if its order is 2. The rate of these reactions may be calculated using either the concentration of one reactant squared or the concentration of two distinct reactants.

Hence, the correct option is (a) one.

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