27 verified questions · ~24 minutes · answer key checked against the official NTA final key across multiple sources. Text-only questions (diagram-based excluded until they can be shown properly).
Match List I with List II. List-I (Substances): A. Ziegler catalyst; B. Blood pigment; C. Wilkinson catalyst; D. Vitamin B12. List-II (Element present): I. Rhodium; II. Cobalt; III. Iron; IV. Titanium. Choose the correct answer from the options given below:
In the chromyl chloride test for confirmation of Cl⁻ ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and 10% H₂O₂ turns the organic layer blue, indicating formation of chromium pentoxide. The oxidation state of chromium in that is:
Answers are revealed after you attempt — that's what makes the diagnosis honest.