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Q. Brass is an alloy of
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Q. Water, on passing over rocks, becomes hard because it disolves
Q. Gammaxene, D.D.T. & Bleaching powder are important compounds of
Q. Which among the following oxides cause the Acid rain ?
Q. Which one is not a pure form of carbon?
Q. Which among the given is not a compound of calcium?
Q. Which of the following elements does not spread pollution?
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