MCQ
$O _3$ reacts with $CH _2= CH _2$ to form ozonide. On hydrolysis it forms …………….
- AEthylene oxide
- ✓$HCHO$
- C$CH _3 CHO$
- D


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| Column I | Column II |
| A. Vitamin A | 1. Absorption and maintanence of calcium |
| B. Vitamin E | 2. Vision and growth |
| C. Vitamin K | 3. Antioxidant |
| D. Vitamin D | 4. Blood clotting |
| Column – I | Column – II |
| A. Cyanide process | (i) Ultrapure Ge |
| B. Froth floatation process | (ii) Dressing of ZnS |
| C. Electrolytic reduction | (iii) Extraction of Al |
| D. Zone refining | (iv) Extraction of Au |
| (v) Purification of Ni |