Question

The water glass method of egg preservation uses the chemical:

• A. 10% polyvinyl alcohol
• B. 10% calcium carbonate
• C. 10% sodium silicate
• D. 10% calcium hydroxide

Hint:

Sodium silicate effectively creates a protective barrier on the eggshell, ensuring prolonged freshness and preventing microbial growth.

Answer 1

The Correct Option is C

Step 1: Concept
Egg preservation involves using chemicals to create a protective barrier around the egg, preventing microbial growth and maintaining freshness. The water glass method is one such technique that uses specific chemical solutions.

Step 2: Meaning
The term "water glass" in this context refers to a solution containing sodium silicate (also known as liquid glass), which forms a protective layer on the eggshell when applied.

Step 3: Analysis
- Option A: 10% polyvinyl alcohol - This is used in some food preservation methods for its water-retaining properties but does not form a strong barrier against microorganisms. - Option B: 10% calcium carbonate - While it can neutralize acids, it is not effective as a preservative solution for eggs due to its insolubility and lack of protective layer formation. - Option C: 10% sodium silicate (water glass) - Sodium silicate forms a stable, non-porous film on the eggshell when applied, effectively preventing moisture loss and microbial entry. This makes it an ideal choice for preserving eggs using the water glass method. - Option D: 10% calcium hydroxide - Although it can be used in some industrial applications, it is not commonly used in the water glass method of egg preservation due to its strong alkalinity and potential to damage the eggshell.

Step 4: Conclusion
The correct chemical for the water glass method of egg preservation is sodium silicate (10% solution). Final Answer: (C)