An ornamental of gold having $75\%$ of gold, it is of .............. carat.
$18$
$16$
$24$
$20$
$\underbrace {\mathop {Hg{I_2}\,}\limits_{'X'} \xrightarrow[{Sublimation}]{\Delta }\,\mathop {Hg{I_2}}\limits_{'Y'} \xrightarrow{{Cooling}}\mathop {Hg{I_2}}\limits_{'Z'} }_{On\,\,rubbing}$
Metal-metal bonding is more frequent in $4d$ or $5d$ series than in $3d$ series due to
$Fe,$ $Co$ and $Ni$ have valuable catalytic properties in process involving
Besides $Zn$ and $Cu$, german silver contains the metal
Find the species having the magnetic moment value of $5.92\ BM$