An ornamental of gold having $75\%$ of gold, it is of .............. carat.
$18$
$16$
$24$
$20$
In making gun-berrel, the steel used is
What is the magnetic moment of ${[Fe{F_6}]^{3 - }}$
Stainless steel contains ........... $\%$ $Cr$
German silver is an alloy of $Cu$ with
$Cr^{+2}$ has a magnetic moment same as that of