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Q.10 A non-metal A which is the largest constituent of air, when heated with H2 in 1:3
               ratio in the presence of catalyst (Fe) gives a gas B. On heating with O2 it gives an oxide
               C. If this oxide is passed into water in the presence of air it gives an acid D which acts
               as a strong oxidising agent.
               (a) Identify A, B, C and D
               (b) To which group of periodic table does this non-metal belong?































































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