Double base smokeless gun powder contains the following elements:
**Core Concept**
Double base smokeless gun powder is a type of explosive propellant used in firearms, characterized by its high energy density and low smoke production. It is a mixture of nitrocellulose and nitroglycerin, which provide the necessary energy for propelling projectiles.
**Why the Correct Answer is Right**
Double base smokeless gun powder is a complex mixture of nitrocellulose and nitroglycerin. Nitrocellulose is a nitrated cellulose polymer that provides a stable and manageable fuel source, while nitroglycerin is a highly energetic liquid that enhances the propellant's power. The combination of these two components results in a smokeless and high-energy propellant.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because double base smokeless gun powder does not contain gunpowder, which is a mixture of sulfur, charcoal, and potassium nitrate.
* **Option B:** This option is incorrect because double base smokeless gun powder does not contain nitrocellulose alone; it is a mixture of nitrocellulose and nitroglycerin.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that double base smokeless gun powder is used in various applications, including firearms, fireworks, and some medical devices. Its unique composition and properties make it an essential component in these fields.
**Correct Answer: D. Nitrocellulose and Nitroglycerin.**