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In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of $AgBr$. The percentage of bromine in the compound is: (at. Mass Ag = 108, Br = 80)

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The number of geometric isomers that can exist for square planar $[Pt(Cl)(py)(NH_{3})(NH_{2}OH)]_{+}$ is (py = pyridine):

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