The compound KBrO₃ decomposes when heated.

2KBrO₃ → 2KBr + 3O₂

a. State the oxidation numbers of bromine in:

i. KBrO₃ 

ii. KBr.

b. Explain using oxidation numbers why this reaction is a redox reaction.

c. State the systematic name of KBrO₃.

d. When KBrO₃ reacts with hydrazine, N₂H₄, nitrogen gas is evolved.

2KBrO₃ + 3N₂H₄ → 2KBr + 3N₂ + 6H₂O

i. What is the oxidation number change of the bromine atom when KBrO₃ is converted to KBr?

ii. What is the oxidation number change for each nitrogen atom when N₂H₄ is converted to N₂?

iii. Use your answers to i and ii to explain why 2 moles of KBrO₃ react with 3 moles of N₂H₄.