Which one of the following compounds is not coloured
$N{a_2}CuC{l_4}$
$N{a_2}CdC{l_4}$
${K_4}Fe{(CN)_6}$
${K_3}Fe{(CN)_6}$
“$925$ fine silver” means an alloy of :
Prussian blue is due to the formation of
The stability of $Cu ^{2+}$ is more than $Cu ^{+}$salts in aqueous solution due to -
Stainless steel is an alloy of iron with
How many unpaired electrons are there in $N{i^{2 + }}$