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