Which alloy of steel is used in making automobile parts and utensils?

Given below are two statements:
Statement $I :$ Potassium permanganate on heating at $573 \ K$ forms potassium manganate.
Statement $II :$ Both potassium permanganate and potassium manganate are tetrahedral and paramagnetic in nature.
In the light of the above statements,choose the most appropriate answer from the options given below.

Which substance is used to produce very low temperatures by magnetic effects?

When a mixture of potassium dichromate and potassium chloride is heated with concentrated $H_2SO_4$,which of the following is produced as red vapors?

Amphoteric oxide$(s)$ of $Mn$ is/are:

Stainless steel is non-corrosive. This character is more prominent in