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Q. Which subatomic particle has a negative charge?
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Q. Which statement best describes an O3 molecule?
Q. Which combination will produce a precipitate?
Q. Name the gas used in preparation of bleaching powder
Q. Most poisonous pollutant in water is
Q. A substance mixed with metals to promote fusion (melting) is called
Q. Besides hydrogen, which of the following elements is common in organic compounds?
Q. The M.K.S. system was first introduced by
Q. The gas in the atmosphere that helps in burning is
Q. A pure substance can only be
Q. Impure sodium carbonate obtained in the industrial process is called
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