Chemistry · Coal
बिटुमिनस कोयला में कार्बन की मात्रा लगभग कितने प्रतिशत तक होती है?
- 130% से कम
- 290% - 95%
- 370% - 85%✓
- 440% - 55%
सही उत्तर देखें
70% - 85%
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