The ionic charges on chromate ion and dichromate ion respectively are:

The colour imparted by $Co(II)$ compounds to glass is

$MnO_2$ when fused with $KOH$ and oxidised in air gives a dark green compound $X$. In acidic solution,$X$ undergoes disproportionation to give an intense purple compound $Y$ and $MnO_2$. The compounds $X$ and $Y$,respectively,are

What is the use of potassium permanganate $(KMnO_4)$?

The starting material for the manufacture of $KMnO_4$ is

The spin-only magnetic moment value of the most basic oxide of vanadium among $V_2O_3$,$V_2O_4$,and $V_2O_5$ is $..... \ B.M.$ (Nearest Integer).