1)

Identify  the metal that forms  colourless  compounds


A) Iron (Z=26)

B) Chromium (Z=24)

C) Vanadium (Z=23)

D) Scandium (Z=21)

Answer:

Option D

Explanation:

 d-block elements show +3 as the most common oxidation state. For scandium (Z=21) , electronic configuration  d1s2. After the removal of +3 electrons

(Sc3+)  , it acquires a stable configuration (d0) . Hence , it forms colourless compounds.