Across
- 3. The single acid which dissolves gold
- 7. Elements that show the properties of both metals and non metals
- 9. What are enzymes
- 12. The main constituent of biogas
- 13. The elements which behave chemically both as a metal and a non metal
- 14. The oldest known organic compound
- 15. Which gas is known as the stranger gas
Down
- 1. What is the taste of an acid
- 2. Hardest form of carbon
- 4. Nail polish remover contains
- 5. The most mallteable metal
- 6. The most electronegative element
- 8. Bleaching action of chlorine is by
- 10. The heaviest metal known is
- 11. Natural rubber is a polymer derived from