If the temperature is increased by 10°C the rate of the reaction becomes:

Options

A. Ten times more
B. Ten times less
C. Two times more
D. Two times less

Answer

To solve the question regarding how the rate of a reaction changes with a 10°C increase in temperature, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Relationship Between Temperature and Rate Constant**:
- The rate of a chemical reaction is generally dependent on the rate constant (k). According to the Arrhenius equation, an increase in temperature typically increases the rate constant.

2. **Identify the Effect of Temperature Increase**:
- It is commonly observed that for many reactions, the rate constant doubles with every 10°C increase in temperature. This is a general rule of thumb known as the temperature coefficient.

3. **Apply the Doubling Rule**:
- If the temperature is increased by 10°C, we can say that the rate constant (k) will become \( k_2 = 2k_1 \), where \( k_1 \) is the rate constant at the initial temperature and \( k_2 \) is the rate constant after the temperature increase.

4. **Relate Rate to Rate Constant**:
- The rate of the reaction is directly proportional to the rate constant. Therefore, if the rate constant doubles, the rate of the reaction will also double.
- Mathematically, if the initial rate is \( R_1 = k_1[A] \) and the new rate after the temperature increase is \( R_2 = k_2[A] \), we can substitute \( k_2 \):
\[ R_2 = 2k_1[A] = 2R_1 \]

5. **Conclusion**:
- Thus, when the temperature is increased by 10°C, the rate of the reaction becomes two times more than the original rate.

### Final Answer:
The rate of the reaction becomes **2 times more**.