A student took four test-tubes containing solutions of different colours marked I, II, III and IV as shown here. The test-tubes containing copper sulphate solution and ferrous sulphate solution could be the tubes :
![](https://search-static.byjusweb.com/question-images/img/study_content/content_ck_images/images/Pg20315_29.png)
(1) I and III
(2) II and III
(3) III and IV
(4) II and IV