Heating an aqueous solution of a salt of this anion and sulfuric acid is used to measure the “[this anion] index” of water quality. The Kappa number of pulp is (-5[1])determined by measuring the consumption of a salt with this anion. A salt of this anion and osmium tetroxide are commonly (-5[1])used in the syn (-5[1])dihydroxylation of alkenes. Heating alkylbenzenes with an aqueous solution of a salt with this anion produces benzoates. A solution with this anion changes to a (*) brown (-5[1])color to (-5[1])show the presence of an unsaturated carbon-carbon (-5[1])double bond in Baeyer’s (-5[1])test. Due to the (-5[1])+7 oxidation state of its central (-5[2])atom, this (10[1])anion is a (-5[1])strong oxidizing (10[1])agent when bonded to (10[2])potassium. For (10[1])10 (10[2])points, purple (-5[1])solutions are produced by (10[1])what polyatomic anion composed of four oxygens around a manganese (10[2])atom? (10[6]0[6])■END■