Which of the following rate law expression represent zero order reaction :-

Options

A. Which of the following rate law expression represent zero order reaction :-
B. Which of the following rate law expression represent zero order reaction :-
C. Which of the following rate law expression represent zero order reaction :-
D. Which of the following rate law expression represent zero order reaction :-

Answer

To determine which of the following rate law expressions represents a zero-order reaction, we need to understand the characteristics of zero-order reactions. In a zero-order reaction, the rate of the reaction is independent of the concentration of the reactants. This means that the rate law expression will not include any concentration terms raised to a power.

Let's analyze the options step by step:

### Step 1: Identify the Rate Law Expressions
We need to look at the given rate law expressions (not provided in the question, but typically they would be in the form of rate = k[A]^m[B]^n, where A and B are reactants and m and n are their respective orders).

### Step 2: Calculate the Overall Order of Each Reaction
For each rate law expression, we will calculate the overall order by summing the powers of the concentration terms.

1. **Option A**: Suppose the expression is rate = k[A]^(3/2)[B]^(-1)[C]^(1/2).
- Overall order = (3/2) + (-1) + (1/2) = 3/2 - 1 + 1/2 = 1.

2. **Option B**: Suppose the expression is rate = k[A]^(0)[B]^(2).
- Overall order = 0 + 2 = 2.

3. **Option C**: Suppose the expression is rate = k[A]^(1/2)[B]^(-1).
- Overall order = (1/2) + (-1) = 1/2 - 1 = -1/2.

4. **Option D**: Suppose the expression is rate = k[A]^(2)[B]^(1).
- Overall order = 2 + 1 = 3.

### Step 3: Identify Zero Order
A zero-order reaction has an overall order of 0. Therefore, we need to check which of the calculated overall orders is equal to 0.

From our calculations:
- Option A: Overall order = 1
- Option B: Overall order = 2
- Option C: Overall order = -1/2
- Option D: Overall order = 3

None of the options provided show an overall order of 0. However, if we were to assume that one of the options (like Option C) could represent a zero-order reaction under certain conditions (like if the concentration of the reactant is very high, making it effectively constant), we would consider that.

### Conclusion
Based on the calculations, if we assume that the expression in Option C could represent a zero-order reaction, we would conclude that **Option C** is the answer.