When potassium permanganate ($KMnO_{4}$) is heated to 513 K, it undergoes thermal decomposition. This is a standard inorganic chemistry reaction used to prepare potassium manganate.
The decomposition reaction is represented as follows: $$2KMnO_{4} \xrightarrow{513 K} K_{2}MnO_{4} + MnO_{2} + O_{2}$$
The product $K_{2}MnO_{4}$ (potassium manganate) is known to be green in color. Regarding its magnetic property, the manganese in $K_{2}MnO_{4}$ is in the +6 oxidation state ($MnO_{4}^{2-}$). The electronic configuration of $Mn^{6+}$ is $[Ar] 3d^{1}$, which contains one unpaired electron, making it paramagnetic.
Final Answer: K_{2}MnO_{4}
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