| 1. Biotite |
| 2. Phlogopite |
| 3. Muscovite |
A) 1 only
B) 1 and 2 only
C) 2 and 3 only
D) 1, 2 and 3
Correct Answer: D
Solution :
The quality of iron ore depends on the percentage of pure iron in the ore and also on the absence of impurities. From this point of view following ores are recognized in descending order of their quality.| Iron ore | Percentage pure iron content |
| Haematite | About 70 |
| Magnetite | 60-70 |
| Limonite | 40-60 |
| Siderite | Less than 40 |
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