an acidified k2cr2o7 paper turns green on being exposed to so2 why - Chemistry - Redox Reactions

Question

an acidified k2cr2o7 paper turns green on being exposed to so2 why

Vartika Jain · Accepted Answer

Dear Student,

When SO2 is exposed to acidified potassium dichromate paper, the paper turns green
 The green colour is due to formation of Cr2(SO4)3 i
e  chromic sulphate
 3SO2 + K2Cr2O7 + H2SO4 → K2SO4 + Cr2(SO4)3 + H2O

an acidified k2cr2o7 paper turns green on being exposed to so2. why