Batman is back!
Thanks to the Riddler's medicine, batman is back on the streets of Gotham.
Scarecrow's new fear toxin has been mixed with the city's drinking water supply. People who drank the water would die after seeing their worst fears come true.
Batman unable to analyse the compound goes to Mr.Freeze's lab to ask for help.
Mr.Freeze is willing to give batman the antidote only if Batman answers his question,
"What is the bond order of the compound that has its chemical formula identical to the spelling of NO?"
Hint: Use a molecular energy diagram.