Which of the following statements about the interstitial compounds is INCORRECT?

 

The ore chromite is _____.

How is sodium chromate converted into sodium dichromate in the manufacture of potassium dichromate from chromite ore?

Potassium dichromate is a good oxidizing agent, in acidic medium the oxidation state of chromium changes by ______.

Which one of the following statements is CORRECT when ${\mathrm{SO}}_{\mathrm{2}}$ is passed through acidified ${\mathrm{K}}_{\mathrm{2}}{\mathrm{Cr}}_{\mathrm{2}}{\mathrm{O}}_{\mathrm{7}}$ solution?

The reaction of ${\text{K}}_{\text{2}}{\text{Cr}}_{\text{2}}{\text{O}}_{\text{7}}$ with $\text{NaCl}$ and concentrated ${\text{H}}_{\text{2}}{\text{SO}}_{\text{4}}$gives _____.

${\mathrm{KMnO}}_{\mathrm{4}}$ can be prepared from ${\mathrm{K}}_{\mathrm{2}}{\mathrm{MnO}}_{\mathrm{4}}$ as per the reaction

$3{\mathrm{MnO}}_4^{2-}+2{\mathrm{H}}_{\mathrm{2}}\mathrm{O}\stackrel{}{\to } 2{\mathrm{MnO}}_4^{-}+{\mathrm{MnO}}_{\mathrm{2}}+ 4{\mathrm{OH}}^{\mathrm{-}}$

The reaction can go the completion by removing ${\mathrm{OH}}^{–}$ ions by adding.

On heating potassium permanganate, one of the following compound is not obtained.

${\text{KMnO}}_{\text{4}}$ in basic medium is reduced to ______.