1. What's the lightest element in the periodic table?
2. What is the atomic number of carbon?
3. Which gas is called a noble gas?
4. Which of these has the highest pH value?
5. Mercury and sodium street lamps light up because of ___
6. Which of these is not a form of carbon?
7. Combustion is classified as what kind of process?
8. Which of the following is used in pencils?
9. What is the alkaloid naturally found in coffee,cocoa and cola nut?
10. What is ink prepared from?
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