1. On burning charcoal which of the following gases is produced?   Hydrogen   Oxygen   Nitrous Oxide   Carbon Dioxide   Hint Half-n-half Clue   2. When hydrogen peroxide acts on Manganese Dioxide, oxygen is produced.   True   False   3. Fish breathe through   Gills   Nose   Skin   Lungs   Half-n-half Clue   4. A space that contains no air or any gas is known as   Pressurized Cabin   Hollow   Vacuum   Bubble   Half-n-half Clue   5. The atmosphere exerts pressure on the surface of the earth.   True   False   6. Which of the following is NOT a noble gas?   Krypton   Helium   Argon   Hydrogen   Half-n-half Clue   7. Lime water turns milky after carbon dioxide is passed through it.   True   False