Question

The amorphous form of silica is :

• A. quartz
• B. kieselguhr
• C. cristobalite
• D. tridymite

Answer 1

The Correct Option is B

The question asks about the amorphous form of silica from the given options. To determine the correct answer, let's first understand the forms of silica:

1. Quartz: This is a crystalline form of silica (SiO₂). It is found abundantly in nature and is widely used in the form of sand.
2. Kieselguhr: Also known as diatomaceous earth, kieselguhr is an amorphous form of silica. It is composed of the fossilized remains of diatoms, a type of hard-shelled algae, and has a variety of industrial and filtration uses.
3. Cristobalite: This is another crystalline form of silica, usually formed at high temperatures.
4. Tridymite: Similar to cristobalite, this is also a crystalline form of silica found in volcanic rocks.

Upon evaluating all the options, it is evident that kieselguhr is the only amorphous form of silica listed. An amorphous substance does not have a well-defined crystalline structure, as opposed to crystalline forms which have a distinct and repetitive pattern.

Therefore, the correct answer is kieselguhr.