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hello!!!!
there will two questions expected from 15th group elemnts in JEE mains.impotant topics in 15 th group include preparation and properties of diborane ,tests on ozone,tests of NH3,reaction of H2S and SO2, inert pair effect,properties of halogens,e.t.c . however chemistry is a scoring subject in JEE , so you better thorough with all the topics .
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