The total number of $Mn=O$ bonds in $Mn_2O_7$ is

In the reaction $4K_2Cr_2O_7 \xrightarrow{\text{heat}} 4K_2CrO_4 + 3O_2 + X$,the species $X$ is:

The manganate and permanganate ions are tetrahedral,due to

Which of the following oxidation states of chromium forms the most stable compounds?

The incorrect statement is:

When potassium permanganate $(KMnO_4)$ is heated at $513 \ K$,it decomposes to form two manganese-based products. The physical properties of the product in which manganese has a higher oxidation state than the other are: