ChemistryEasy95×since 2002Q1515K2Cr2O7\mathrm{K_2Cr_2O_7}K2Cr2O7 paper acidified with dilute H2SO4\mathrm{H_2SO_4}H2SO4 turns green when exposed to :ASulphur dioxideBSulphur trioxideCHydrogen sulphideDCarbon dioxideCheck answerSkip