Which of the following compounds is not colored yellow ?
$(NH_4)_3 [As (Mo_3O_{10})_4]$
$BaCrO_4$
$Zn_2[Fe(CN)_6]$
$K_3[Co(NO_2)_6]$
The number of $d-$ electrons in $F{e^{2 + }}$ (at no. of $Fe = 26$) is not equal to that of the
Stainless steel does not rust because
Which ion is not coloured
The aqueous solution containing which one of the following ions will be colourless
Which of the following may be colourless