Which of the following acts as rocket propellants?

Options

A. Liq.`H_(2)`+Liq.`O_(2)`
B. Liq.`N_(2)`+Liq.`O_(2)`
C. Liq.`H_(2)`+Liq.`N_(2)`
D. Liq.`O_(2)`+Liq. Argon

Answer

To determine which substances act as rocket propellants, we need to consider the properties and common uses of various chemicals in rocketry. Here’s a step-by-step solution to the question:

### Step 1: Understand Rocket Propellants
Rocket propellants are substances that produce thrust through combustion. They typically consist of a fuel and an oxidizer. The fuel provides the energy, while the oxidizer supplies the oxygen needed for combustion.

**Hint:** Remember that a propellant must include both a fuel and an oxidizer to be effective in a rocket.

### Step 2: Identify Common Rocket Propellants
Two of the most commonly used rocket propellants are:
- **Liquid Hydrogen (LH2)**: This is a lightweight fuel with a high specific impulse, meaning it provides a lot of thrust for its weight.
- **Liquid Oxygen (LOX)**: This acts as an oxidizer, supporting the combustion of the fuel.

**Hint:** Think about the role of each component in the combustion process.

### Step 3: Analyze the Options
Now, let's look at the options provided in the question. If one of the options is "liquid hydrogen and liquid oxygen," we can conclude that this combination is indeed a well-known rocket propellant.

**Hint:** Check if the options include both a fuel and an oxidizer together.

### Step 4: Conclusion
Based on the analysis, the correct answer is the combination of liquid hydrogen and liquid oxygen, as they are commonly used together in rocket propulsion systems.

**Final Answer:** The answer is option 1: Liquid Hydrogen and Liquid Oxygen.