ChemistryHard35×since 2002Q1801When MnO2\mathrm{MnO}_2MnO2 and H2SO4\mathrm{H}_2 \mathrm{SO}_4H2SO4 is added to a salt (A)(\mathrm{A})(A), the greenish yellow gas liberated as salt (A) is :ANH4Cl\mathrm{NH}_4 \mathrm{Cl}NH4ClBCaI2\mathrm{CaI}_2CaI2CKNO3\mathrm{KNO}_3KNO3DNaBr\mathrm{NaBr}NaBrCheck answerSkip