Error:
HI %2B K2Cr2O7 %2B H2SO4 %3D I2 %2B Cr2%28SO4%293 %2B K2SO4 %2B H2O
^
Unexpected character ('%')HI %2B K2Cr2O7 %2B H2SO4 %3D I2 %2B Cr2%28SO4%293 %2B K2SO4 %2B H2O
^
Unexpected character ('%')