Which of the following is more paramagnetic
$F{e^{ + 2}}$
$F{e^{ + 3}}$
$C{r^{ + 3}}$
$M{n^{ + 3}}$
Passing $H_2S$ gas into a mixture of $Mn^{+2}, Ni^{+2}, Cu^{+2}$ and $Hg^{2+}$ ions in an acidified aqueous solution precipitates
What are alloys? Name an important alloy which contains some of the lanthanoid metals. Mention its uses.
Write a note on halide compounds of transition elements.
Which of the following compounds is not coloured ?