Yes, but it may look a little odd to some people.
Yes it's possible. Many brunettes have yellow/blonde highlights in their hair.
Yes it's possible.
Chlorine
It depends on wether or not the black haired person has any redhead genes in his/her family. If they got a redhead gene from one of their parents, grandparents, ect. Then it's possible...
Yes
Yes
yes
They may be harder to see than regular streaks...but yes.
A Western Tanager.
Yes, but they may be hard to see. But it is possible to do.
Yes, gold has a yellow streak when scratched on a streak plate.
Yes, but they may be hard to see.