The acidic igneous rocks contains silica

A. > 65 %

B. < 65 %

C. 60 - 65%

D. None of these

Answer: Option A

Solution(By Examveda Team)

The acidic igneous rocks contain silica > 65%.
Acidic rock or acid rock refers to the chemical composition of igneous rocks that has 63% of SiO₂ content. Rocks described as acidic usually contain more than 20% of free quartz. Typical acidic rocks are granite or rhyolite.
It was based on the idea that high silica rocks are acidic and on the contrary the rocks with low silica content are basic.