Key in the oxidation number

Exercise and reference answers

Questions

1. Answer

   1

   Question

   What is the oxidation number of hydrogen in most of its compounds?

2. Answer

   -1

   Question

   What is the oxidation number of fluorine in all its compounds?

3. Answer

   0

   Question

   What is the oxidation number of an element in its free state?

4. Answer

   4

   Question

   What is the oxidation number of carbon in CO2?

Instructions

Work out each oxidation number and key it in on the pad.

Explanation