The statement , '' if a chemical process is affected by more than one factor , than its rate will be determined by the factor which directly affects the process of its quantity is changed " was proposed by

Options

A. Von Mayer
B. Arnon
C. Blackman
D. Hill

Answer

To solve the question regarding the statement about the rate of a chemical process being determined by the factor that directly affects it when multiple factors are involved, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Statement**:
The statement indicates that in a chemical process influenced by multiple factors, the rate of the process is determined by the factor that has the most direct impact when its quantity is altered.

2. **Identifying the Concept**:
This concept is related to the idea of limiting factors in biochemical processes. It suggests that when several factors are at play, one factor will limit the rate of the process if it is at its minimum value.

3. **Historical Context**:
The statement is linked to a scientific principle proposed by a notable figure in the field of biology or biochemistry.

4. **Evaluating the Options**:
- **Worn May**: Not widely recognized for this principle.
- **Unknown**: Not a valid option.
- **Blackman**: Known for the law of limiting factors.
- **Hill**: Associated with the Hill reaction but not this specific statement.

5. **Conclusion**:
The correct answer is **Blackman**, who proposed the law of limiting factors in 1905. This law states that the rate of a process is determined by the factor that is closest to its minimum value when multiple factors are affecting the process.

### Final Answer:
The statement was proposed by **Blackman**.