Error:
NaCrO2 %2B PbO2 %2B NaOH %3D Na2CrO4 %2B Na2PbO2 %2B H2O
^
Unexpected character ('%')NaCrO2 %2B PbO2 %2B NaOH %3D Na2CrO4 %2B Na2PbO2 %2B H2O
^
Unexpected character ('%')