The material used in the manufacture of lead pencil is 1). Graphite 2). Lead 3). Carbon 4). Mica
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1. Beryllium Sulphate is less soluble in water due to ?
2. The octane number of zero is assigned to
3. Question 7.33:Balance the following equation: XeF6 H2O → XeO2F2 HF
4. Which ofthe following can be used to absorb neutrons to control the chain reaction during nuclear fission?
5. Philosopher’s wool is chemically
6. Question 3.6:Write the atomic number of the element present in the third period and seventeenth group of the periodic table.
7. An atom of an element has atomic number 17 and mass number36 The number of neutrons in its nucleus is
8. The chemical name of 'laughing gas is
9. Question 14.20:For your agricultural field or garden you have developed a compost producing pit. Discuss the process in the light of bad odour, flies and recycling of wastes for a good produce.
10. Enzymes-
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