Which of the following statements concerning the separation of metal ions into analytical groups i-v is/are correct? 1. only the least soluble sulfides will precipitate in an acidic solution of h2s. 2. k+ and na+ are precipitated in the last step of the separation scheme. 3. the formation of a precipitate with the addition of dilute hcl(aq) indicates the original solution contains all of the ions of analytical group i (the ions which precipitate as chlorides). a. 1 only b. 2 only c. 3 only d. 1 and 2 e. 1, 2, and 3