A. Oxygen, iron, and potassium,
B. Oxygen, iron, and silicon
C. Silicon, aluminum, and oxygen
D. Silicon, iron, and magnesium
Free MCQs for FPSC, NTS, PPSC, PMS, CSS & All Pakistan Exams 2026
A. Oxygen, iron, and potassium,
B. Oxygen, iron, and silicon
C. Silicon, aluminum, and oxygen
D. Silicon, iron, and magnesium