Diamond is harder than graphite because of
1). difference in layers of atoms
2). tetrahedral structure of diamond
3). difference of crystalline structures
4). None of these
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1. The material used in the manufacture of lead pencil is
2. Cement is usually a mixture of
3. What is the product formed when sodium bicarbonate is heated strongly?
4. Natural rubber is the polymer of:
5. Terylene is a condensation polymer of ethylene glycol and which acid?
6. In galvanization, iron is coated with
7. Which inetal does not undergo corrosion due to the formation of oxide layer
8. Which of the following elements is non radioactive ?
9. The chemical name of "laughing gas is
10. The third shell of an atom can have a maximum of ______ electrons.