Polythene is polymer of
1). Ethylene
2). Propylene
3). Acetylene
4). Aniline
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1. The metal extracted from Bauxite is
2. Ruby and sapphire are oxides of
3. The chemical name of ratpoison is H
4. Spirit in contact with body gives cool sensation because it is :
6. A change in which one or more new substances are formed is called _________.
7. Which one of the following pairs is NOT correctly matched?
8. How many neutrons does iron have?
9. Question 1.8:Ionic solids conduct electricity in molten state but not in solid state. Explain.