Strength and magnetic charge of KNO3

A question asks for physical properties of potassium nitrate, and specifically asks for "magnetic charge" and "strength" (that is how it is phrased). I have properties such as white in color, vitreous, odorless, and melting point of $\pu{334^\circ C}$. It is relatively stable, and a strong oxidizer, so it acts as a good fuel source. However, is strength asking about bond strength? And I'm not sure how to find the magnetic charge since none of my research has found anything.


