The spin only magnetic moment $(\mu)$ value $(B.M.)$ of the compound with strongest oxidising power among $Mn_2O_3$,$TiO$,and $VO$ is $....$ $B.M.$ (Nearest integer).

Oxidation states of the metal in the minerals haematite and magnetite,respectively,are

Which of the following is used for making railway tracks?

$K_2MnO_4$ can be converted into $KMnO_4$ by

The green paramagnetic species formed by heating $KMnO_4$ at $513 \ K$ is

Identify correct statements from below:
$A$. The chromate ion is square planar.
$B$. Dichromates are generally prepared from chromates.
$C$. The green manganate ion is diamagnetic.
$D$. Dark green coloured $K_2MnO_4$ disproportionates in a neutral or acidic medium to give permanganate.
$E$. With increasing oxidation number of transition metal,ionic character of the oxides decreases.
Choose the correct answer from the options given below: