The natural source of hydrocarbon is
1). Crude oil
2). Biomass
3). Coal
4). Carbohydrates
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1. The gas used to extinguish fire is
2. Which of the following is an ore of iron?
3. Sodium vapour lamps glow with yellow colour. This is due to
4. Which one of the following pairs is NOT correctly matched
5. Water gas is the mixture of
7. Which one of the following elements is least likely to be found in commercial fertilisers?
9. Which one of the following chemicals helps in fruit ripening?
10. Wood spirit is