Yes, it will. It will work with A, B, G, and N standards.
The same as with wireless G card and G router.
Yes.
Yes it is backwards compatible
Yes.
Rather no than yes. It will work if the router is configured to work in the "G" mode.
No they do not. They simply have to work on a compatible frequency. Such as wireless a, b, g etc.
Yes, you can. Wireless N devices are reversely compatible with G networks.
A Wireless G router provides Wireless access to 802.11g compatible devices
Yes, you can. You have to configure your router to work in compatibility for G networks.
If you have free PCI ports then any (but your router supports for instance only wireless G it's better to buy PCI card with wireless G support and not less).
A wireless router "N" has one of the fastest speeds available. It is more costly than the basic wireless router speed of "G". To ensure getting the fastest speed, be sure both the wireless router and wireless card have the same speed. Most laptops with built in wireless cards only have a speed of "G". The network runs at the slowest speed that is being used. An upgraded card may be needed.
No.