Which one of the following statements is correct when SO2 is passed through acidified K2Cr2O7solution?
SO2 is reduced.
Green Cr2SO43 is formed.
The solution turns blue.
The solution is decolourised.
K2Cr2O7+H2SO4+3SO2→K2SO4+Cr2SO43+H2O
aq. Cr2SO43 is green coloured solution.