Percentage of lead in lead pencils is
1). 0
2). 66
3). 40
4). 80
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1. Decane has how many hydrogen atoms?
2. One of the constituents of tear gas is
3. Which of the following is an iron ore ?
4. Hydrogen bomb is based on the principle of
5. When a gas is subjected to adiabatic expansion, it gets cooled due to-
7. 24 carat of diamond is equal to
8. Which one of the following pairs is NOT correctly matched
9. Which is the most economical method of removing solid matter from water?