How many unpaired electrons are there in $N{i^{2 + }}$
$2$
$4$
$5$
$0$
Which element can have oxidation state from $4 $ to $6 $?
Iron becomes passive by ..................... due to formation of .....................
The number of unpaired electrons is maximum in (Atomic no. : $ Ti = 22; V= 23; Cr = 24; Fe = 26$)
Which of the following contain $'Sn'$ metal
Transition elements are more metallic than representative elements ($s$ and $p-$ block elements) due to