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JEE Main 20199 AprilEvening Shift
Exam
JEE Main
Year
2019
Date
9 April
Shift
Evening Shift
Subject
Chemistry
Chapter
p Block Elements (Group 13 & 14)

JEE Main 2019 · 9 April · Evening Shift · Chemistry · p Block Elements (Group 13 & 14)

The amorphous form of silica is:

The amorphous form of silica is:

Options

  1. Aquartz
  2. Bkieselguhr
  3. Ctridymite
  4. Dcristobalite

Correct answer

B. kieselguhr

Step-by-step 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.
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