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Q. The natural source of hydro-carbon is
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Q. What is the main product of photosynthesis?
Q. 'Gunpowder' was invented by
Q. Which among the given is used in making smoke bombs
Q. Who among the following defined the law of gravitation
Q. In bio fortification technique plant breeders use breeding to overcome
Q. Permanent hardness of water may be removed by the addition of:
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