Professor Tarasankar Pal, Department of Chemistry, Indian Institute of Technology, Kharagpur

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1. What is the composition of writing chalk?
2. What the compound that makes the egg shell so hard?
3. What makes our teeth so sparking?
4. What are common calcium compounds available in the market?
5. Is carbon dioxide toxic?
6. What is the hardest common natural material available on earth?
7. What are the constituents of spider web?
8. What element bear the highest melting point?
9. What is the thinnest and strongest material discovered and for which Nobel Prize was awarded?
10. Which element can form highest number of compounds?

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