Consider the following statements: I. Silicon and oxygen are common elements in all types of feldspar, while sodium, potassium, calcium, and aluminium are found in specific feldspar varieties. II. More than half of the Earth's crust is composed of feldspar alone, while quartz is another major component. Which of the above statements is/are correct?

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?