1. When hydrogen peroxide acts on Manganese Dioxide, oxygen is produced.   True   False   2. Air is a   Gas   Plasma   Liquid   Solid   Hint Half-n-half Clue   3. Which of the following is not a constituent of the atmosphere?   Oxygen   Carbon Dioxide   Aluminum   Nitrogen   Half-n-half Clue   4. Carbon dioxide is lighter than air.   True   False   5. A barometer is used for measuring   Temperature   Atmospheric Pressure   Annual Rainfall   Humidity   Half-n-half Clue   6. Lime water turns milky after carbon dioxide is passed through it.   True   False   7. Nitrogen constitutes nearly __ % of the atmosphere.   57   42   21   79   Half-n-half Clue