Yes it is wired with copper 2 wire is also known as 14/2 wire is use for switches,outlets,lights. and a 15a outlet should only be on a 15a breaker the main power feed to your meter to your panel is aluminum and can take more of a load than copper.
In the US, 15 amp receptacles can be installed on 20 amp circuits if there is more than one receptacle on that circuit.
Copper wire can carry a larger load than aluminum wire of the same size.
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Not unless the wire going to the refrigerator outlet is AWG 10/2. If it is wired with 12/2 wire then you must use a 20 amp breaker. Using a 30 amp breaker is dangerous and a fire hazard.
A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.
10 AWG.
Not legally because the rating of the 30 amp receptacle would have a 50 amp breaker ahead of it. If you reduced the feed breaker to 30 amps and still use the #6 wire, this would be within the electrical code rules.
2 copper