Which of the following statements is incorrect?
Mercurous ion exists as $Hg^+$
Mercurous ion is diamagnetic and exists as dimer $Hg_2^{2+}$
Mercurous ion is colourless
There is a metallic bond between two $Hg^+$ ions
Vanadium $(III) $ oxide is a strong
The fusion of chromite ore with sodium carbonate in the presence of air leads to the formation of products $\mathrm{A}$ and $\mathrm{B}$ along with the evolution of $\mathrm{CO}_2$. The sum of spin-only magnetic moment values of $A$ and $B$ is .......... $B.M.$ (Nearest integer)
(Given atomic number: $\mathrm{C}: 6, \mathrm{Na}: 11, \mathrm{O}: 8$, $\mathrm{Fe}: 26, \mathrm{Cr}: 24 \mathrm{~J}$
The pair of metal ions that can give a spin-only magnetic moment of $3.9\, BM$ for the complex $[M(H_2O)_6]Cl_2$ is
Which of the following is arranged in order of increasing melting point?