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Q. An element which is preserved under water is
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Q. The term meaning 'copper demon' denotes the metallic element
Q. Hypo, used in photography, is chemically
Q. A chemical reaction that place with the evolution of heat is called a/an
Q. An important green-house gas other than methane being produced from the agricultural fields is
Q. Which of the following is used to increase the anti-knocking property of petrol ?
Q. Chernobyl disaster is the result of pollution by
Q. Detergents produce lather with hard water because
Q. Which of the properties of the elements is a whole number ?
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