Assigning Oxidation Numbers

TIMED Matching Quiz
You will get a different set of SIX matches each time you attempt this quiz.
You will have 1 minute to complete!
Repeat as often as you like.

Match each pair by selecting correct answer from the dropdown menu.
Then click the Check button to see your result.
Hydrogen in HBr
Sodium in NaCl
Oxygen in H2O
Oxygen in H2O2
Oxygen in O2
Potassium in K
Sulfur in H2SO4
Oxygen in NaOH
Chlorine in Cl-
Magnesium in MgO
Phosphorous in H3PO4
Manganese in KMnO4
Oxygen in Na2O2
Carbon in C6H12O6
Hydrogen in NaH
Hydrogen in CaH2
Nitrogen in NO3-
Oxygen in OF2
Sulfur in Na2S4O6
Chromium in Cr2O72-
Chlorine in ClO3-