Oh not prof. vitarelli spots sybil running down the yelling something about her tea prof. vitarelli and prof. snape try to hold her back. but they fail. she yells, i’ve learned another exam question from last year! zinc metal reacts with hydrochloric acid to produce hydrogen gas and an aqueous solution of zinc(ii) chloride. what is the reducing agent in this reaction? maybe prof. umbridge was right in trying to remove her.