Which one of the following elements is found in common in glass, cement, china clay, and quartz?
Q1. Which one of the following elements is found in common in glass, cement, china clay, and quartz?
Answer: Silicon
Explanation: Silicon, in the form of silicon dioxide (SiO₂) or silicates, is the fundamental component of glass (SiO₂), cement (calcium silicates), china clay (kaolinite), and quartz (pure SiO₂).