Most stable compound among the following is
$PbF_4$
$PbI_4$
$PbCl_4$
$PbBr_4$
Which one of the following ions is colourless
Reactivity of transition elements decreases almost regularly from $Sc$ to $Cu$. Explain.
The 'spin only' magnetic moment value of $\mathrm{MO}_4{ }^{2-}$ is . . . . . BM. (Where $\mathrm{M}$ is a metal having least metallic radii. among $\mathrm{Sc}, \mathrm{Ti}, \mathrm{V}, \mathrm{Cr}, \mathrm{Mn}$ and $\mathrm{Zn}$ ).
(Given atomic number: $\mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{~V}=23$, $\mathrm{Cr}=24, \mathrm{Mn}=25$ and $\mathrm{Zn}=30)$
Stainless steel is an alloy of