Q927
Which one of the following is not correctly matched
A.
Feldspars : Potassium silicates
B.
Micas : Iron and aluminium silicates
AnswerC.
Gibbsite : Hydrous oxides of aluminium
D.
Geothite : Hydrous iron oxides
Answer: Option B
Solution
Answer: Option B
Solution:
Feldspar is a group of rock-forming aluminum tectosilicate minerals, containing sodium, calcium, potassium, or barium.Micas are a group of phyllosilicate minerals, not iron and aluminium silicates.
Gibbsite is a hydrous oxide of aluminium. it is an important ore of aluminium.
Goethite is hydrous iron oxide. It is a widespread soil mineral and a major component of many ores, sediments, and soils and it is one of the most thermodynamically stable iron oxides.