A
Q. Which of the following is a man-made source of air pollution ?
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Q. Wax used for making candle is chemically a mixture of
Q. The substance that causes the worst air polution is
Q. The chemical name of laughing gas is
Q. Aluminium surface are often anodised. This means the deposition of a layer of
Q. In an oxygen molecule, two atoms are united by
Q. In upper layer of atmosphere ozone is formed by
Q. When combining with nonmetallic atoms, metallic atoms generally will
Q. Positive ions are formed from neutral atoms by loss of
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