Q949
The occurrence of quartz in high amounts makes a rock
A.
Acidic
AnswerB.
Alkaline
C.
Neutral
D.
None of these
Answer: Option A
Solution
Answer: Option A
Solution:
The occurrence of quartz in high amounts makes a rock Acidic.Rocks are referred to as acidic if they contain more than 20% of free quartz. It is based on the idea that high silica rocks are acidic whereas the rocks with low silica content are basic.
Typical acidic rocks are granite or rhyolite.