MCQ
Rust is :
- AFerric oxide
- ✓Hydrated ferric oxide
- CHydrated ferrous sulphate
- DNone of these
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| S. No. | $\angle\text{ i}$ | $\angle\text{ i}$ | $\angle\theta$ |
| $I$ | $30^{0}$ | $20^{0}$ | $31^{0}$ |
| $II$ | $40^{0}$ | $25^{0}$ | $40^{0}$ |
| $III$ | $50^{0}$ | $31^{0}$ | $49^{0}$ |