Petroleum is a mixture of 1). elements 2). hydrocarbons 3). polymers 4). salts
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1. Solder is an alloy of
2. Which one out of the following helps in burning ?
3. Two elements which are used to absorb neutrons to control the chain reaction during nuclear fission are
4. Ruby and sapphire are oxides of
5. Vinegar is
6. 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.
7. Which of the following constitutes highest percentage of Green House gases?
8. Carbon dioxide is
9. Rusting of iron takes place due to
10. Source of vitamin C is
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