Discussion
Change of haematite to limonite Fe2O3 ⇌ Fe2O3 . 3H2O is an example of :
Answer: B
The change is an example of hydration.
In hydration, water molecules are taken into a mineral's structure without breaking it down chemically. Haematite, Fe2O3, adds water to become limonite, Fe2O3.3H2O (more strictly a mix of hydrated iron oxides). The mineral swells and softens, which helps weathering.
Hydrolysis is different: water's H+ and OH- ions react with the mineral and replace its cations, as when feldspar becomes clay. Carbonation is reaction with carbonic acid, as in limestone solution. Chelation is the binding of metal ions by organic compounds.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development