Whichof the following is incorrect w.r.t. Controlled apparatus of Miller and Urey experiment?

Options

A. `800^@`
B. Electric sparks of 75,000 volt
C. `CH_4 : NH_3 : H_2 = 2 : 2 : 1`
D. Devoid of energy source

Answer

To solve the question regarding the incorrect statement about the controlled apparatus of the Miller and Urey experiment, we can follow these steps:

### Step 1: Understand the Miller and Urey Experiment
The Miller and Urey experiment was designed to simulate the conditions of early Earth to test the hypothesis about the origin of life. They created an environment that mimicked the primitive atmosphere, which was believed to consist of methane, ammonia, hydrogen, and water vapor, but lacked free oxygen.

**Hint:** Familiarize yourself with the basic setup and purpose of the Miller and Urey experiment.

### Step 2: Identify the Components of the Experiment
The experiment included:
- A mixture of gases: Methane (CH₄), Ammonia (NH₃), and Hydrogen (H₂).
- Water to simulate oceans.
- Electrodes to create electrical sparks, simulating lightning.
- A controlled environment without oxygen.

**Hint:** Remember the gases used and their significance in the experiment.

### Step 3: Recall the Ratios of Gases Used
Miller and Urey used a specific ratio of the gases:
- Methane: 2 parts
- Ammonia: 1 part
- Hydrogen: 2 parts

This can be represented as 2:1:2.

**Hint:** Pay attention to the specific ratios of the gases as they are crucial for identifying incorrect statements.

### Step 4: Analyze the Options Given in the Question
The question asks for the incorrect statement regarding the controlled apparatus. You need to evaluate each option presented to determine which one does not align with the known facts about the experiment.

**Hint:** Cross-reference each option with the established facts about the experiment.

### Step 5: Identify the Incorrect Statement
After reviewing the options, the third option states an incorrect ratio of the gases. The correct ratio is 2:1:2 (Methane:Ammonia:Hydrogen), so if any option states a different ratio, it is the incorrect one.

**Hint:** Look for discrepancies in the ratios or any other factual inaccuracies in the options.

### Conclusion
The incorrect statement regarding the controlled apparatus of the Miller and Urey experiment is the one that misrepresents the ratio of gases used. The correct answer is the third option.

**Final Answer:** The third option is incorrect regarding the ratios of methane, ammonia, and hydrogen.