Is there any condutor which can be given almost unlimited charge ?

Is there any conductor which can be given unlimited charge?

Resources which are present in unlimited amount are called

Two conductors are given equal amount of like charges. Can there be any potential difference between them? Explain why?

If we know the capacitance of a given conductor then can we calculate the maximum charge which it can store?

Find the number of carbon atoms including the given structure which can have negative charge in resonating structures. (The structures with charge separation are not accptable)

Find the number of carbon atoms including the given structure which can have negative charge in resonating structures. (The structures with charge separation are not accptable)