Q3 / 90 · JEE Main 2019 (09 Apr Shift 2) · Chemistry

The amorphous form of silica is:

  • A
    quartz
  • Correct answer
    B
    kieselguhr
  • C
    tridymite
  • D
    cristobalite

Solution

Kieselguhr, an amorphous form of silica is used in filtration plants.
Quartz is one of the most common minerals in the earth’s crust having a specific crystalline form.
Cristobalite is a high temperature polymorph of silica, having same chemical formula as quartz but distinct crystal structure.
Tridymite is also a high temperature polymorph of silica and occurs as hexagonal crystals.

Hence, the correct answer is option: 'B'.

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