11.A metal salt solution forms a yellow precipitate with potassium chromate in acetic acid and a white precipitate with dilute sulphuric acid, but gives no precipitate with sodium chloride or iodide. The white precipitate obtained when sodium carbonate is added to the metal salt solution comsists f

12.A moisten salt is rubbed with oxalic acid between the fingers and smells like vinegar. It indicates the presence of

13.Which types of salt produce crackcling noise in dry heating test?

14.Which of the following is not a preliminary test ?

15.A minute quantity of cupric salt is heated on borax bead in reducing foame of bunsen burner, the colour of bead aftercooling will be