शुष्क बर्फ क्या है?

Question

शुष्क बर्फ क्या है?

1. A. ठोस ऑक्सीजन
2. B. ठोस नाइट्रोजन
3. C. ठोस कार्बन डाइऑक्साइड (Correct answer)
4. D. ठोस सल्फर

Correct Answer

Option C — ठोस कार्बन डाइऑक्साइड

Detailed Solution & Explanation

The correct answer is ठोस कार्बन डाइऑक्साइड.

Key Points

• Dry ice is solid carbon dioxide (CO₂), at about −78.5 °C.
• It is called "dry" because it sublimes — passing straight from solid to gas without a liquid stage — leaving no residue.

Additional Information

• Uses: refrigerated transport of food and vaccines, and creating stage fog.
• Sublimation is also shown by camphor, naphthalene, iodine and ammonium chloride.