$\underbrace {\mathop {Hg{I_2}\,}\limits_{'X'} \xrightarrow[{Sublimation}]{\Delta }\,\mathop {Hg{I_2}}\limits_{'Y'} \xrightarrow{{Cooling}}\mathop {Hg{I_2}}\limits_{'Z'} }_{On\,\,rubbing}$
$'X'$ $→$ Yellow, $'Y'$ $→$ Red, $'Z'$ $→$ Yellow
$'X'$ $→$ Red, $'Y'$ $→$ Yellow, $'Z'$ $→$ Red
$'X'$ $→$ Red, $'Y'$ $→$ Yellow, $'Z'$ $→$ Yellow
$'X'$ $→$ Yellow, $'Y'$ $→ $ Red, $'Z'$ $→$ Red
Among $TiF^{2-}_6 ,CoF^{3-}_6 ,Cu_2Cl_2$ and $NiCl^{2-}_4$ the colourless species are
Most stable cation in aqueous medium is
Metre scales are made-up of alloy
Mercury is the only metal which is liquid at ${0\,^o}C$. This is due to its
The $\mathrm{E}^{\circ}$ value for the $\mathrm{Mn}^{3 *} / \mathrm{Mn}^{2+}$ couple is more positive than that of $\mathrm{Cr}^{3+} / \mathrm{Cr}^{2+}$ or $\mathrm{Fe}^{3+} / \mathrm{Fe}^{2 *}$ due to change of