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Q. Brass gets discoloured in air because of the presence of which of the following gases in air ?
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Q. What is the ‘non-stick’ substance used in cookwares ?
Q. Which of the following is used to make light weight, but strong plastic ?
Q. The chemical used for cloud seeding for artificial rains is
Q. The term meaning 'copper demon' denotes the metallic element
Q. The gas used in the manufacture of vegetable oil from vegetable is
Q. The metal generally mixed with gold while making ornaments is
Q. The chemical symbol of Sodium is
Q. What are the physical state of dispersion medium of a cloud ?
Q. The most important fungicide against ptato blight is
Q. Which of the following is neither an element nor a compound?
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