Answer
-1
Work Step by Step
Recall that the sum of all of the oxidation numbers must be 0 in these molecules. We know that the oxidation number of hydrogen is +1. Thus, the oxidation number of chlorine must be -1.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.