What is the oxidation state of Cl in ClO21-?

An experimental procedure requires a 10 ml of acid to be dissolved

How many moles of co2 are produced during the complete combustion of 3.6 moles of c2h6

Which statement is true about the model of the electromagnetic spectrum a: it change the frequencies of light. b: it compare wavelengths of light. c: the color of light waves can be changed using the model. d: the intensities of light waves can be decreased using the model.