Sillicon, Cobalt, Sodium and Selenium are

Cobalt is present in

Oxidation By Selenium Dioxide

Sillicon is an important constituent of

The symbols of the elements cobalt, aluminium helium and sodium respectively written by a student are as follows. Which symbol is the correct one ?

Choose the ODD one out from the following terms given and name the CATEGORY to which the others belong : Iron, Cobalt, Sodium, Copper, Zinc.

Oxidation of propanone with selenium oxide produces

Write two uses of Selenium metal.