Which of the following alloys is used in the construction of the outer fuselage of ultra-high-speed aircraft?

Acidified potassium permanganate solution oxidises oxalic acid. The spin-only magnetic moment of the manganese product formed from the above reaction is $.... \, B.M.$ (Nearest Integer)

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.

What is the oxidation state of osmium in $7B$ and $7C$,respectively?

Which of the following is used for making railway tracks?

On heating pyrolusite with $KOH$ in the presence of air,we get: