The main ore of thorium is_________________?
Correct answer: B. Monazite sand
- A. Pitchblende
- B. Monazite sand
- C. Limonite
- D. Galena
Explanation
Monazite sand, a phosphate mineral containing thorium and rare-earth elements, is the principal commercial ore of thorium. Pitchblende is mainly associated with uranium, while limonite and galena are ores of iron and lead respectively.
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