Rust does not have the properties to catch onto flames. However, if you light it on fire, then it would probably catch in flames but not instantly and will not continue to burn unless you have soaked it in oil or flammable object or substance. :) Hope this helps!
Are found along volcanic island arcs
For C, they would be the same. At the equivalence, you have equal moles of both the acid and the base.
You can reduce the charges and subscripts so it is PbS2
