1. Air is   A Mixture   An Alloy   A Compound   An Element   Hint Half-n-half Clue   2. On burning charcoal which of the following gases is produced?   Oxygen   Hydrogen   Carbon Dioxide   Nitrous Oxide   Half-n-half Clue   3. When hydrogen peroxide acts on Manganese Dioxide, oxygen is produced.   True   False   4. Which of the following is necessary for a substance to burn?   Gasoline   Oxygen   Light   Hydrogen   Half-n-half Clue   5. Dry ice is   Any Frozen Liquid   Ice with salt added   Very Cold Ice   Solid Carbon Dioxide   Half-n-half Clue   6. When we breathe which of the following gases do we use?   Hydrogen   Oxygen   Carbon Dioxide   Helium   Half-n-half Clue   7. Lime water turns milky after carbon dioxide is passed through it.   True   False