They are generally red, however some are more orange or brown.
No, they aren't. In fact, they're pretty much never "red" (except in the sense that some people have "red" ... actually more orange ... hair). See the related link for some pictures of the pelts of...
Red foxes are always reddish in colour.
More of a brown orange color, but it can vary from light orange to black.
Yes, it's coat is just silver.