Double pole and single pole.
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You probably mean to change it to a 240 V outlet... either case, you'll need to run a new wire and install a new breaker.
It enables you to switch off the load from the socket, rather than have to pull the plug out of the socket.
Electrical energy comes out of a wall socket.
If, by 'reverse polarity', you mean the accidental reversal of the line and neutral conductors at the socket outlet or receptacle, then the answer is no.
The screw socket into which an ordinary light bulb is inserted.