Q. The compound dissolved in water to give a solution of pH lower than seven is
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Q. The chemical name of vitamin C is
Q. Brass gets discoloured in air because of the presence of which of the following gases in air?
Q. Which of the following is a man-made source of air pollution ?
Q. The weight of a rusted iron object is _________ that of an unrusted one
Q. What is commonly called limestone is
Q. Ozone depletion in the atmosphere is mainly caused by
Q. The 'Green House effect' is produced due to the presence of excess amount of
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