Due to the presence of an unpaired electron, free radicals are:

A free radical is:

If the colours of salts of transition elements are due to the presence of unpaired electrons in the transition metal ions, which of the following ions will be colourless in aqueous solution

Oxygen molecule is .......... due to the presence of ...... unpaired electrons.

A: Cr_(2)O_(7)^(-2) , 2 is orange in colour R: It is due to the presence of unpaired electrons in d-subshell of Cr.

A: Cr_(2)O_(7)^(-2) , is orange in colour R: It is due to the presence of unpaired electrons in d-subshell of Cr.