Which of these is a property of acids? a) they produce hydrogen gas when reacted with metals. b) they turn litmus paper blue. c) they feel slippery. d) they taste bitter

Generally speaking acids produce a salt and hydrogen gas when they react with metals. This is the result of acids having H+ ions. When acids interact with metal, extra hydrogen ions are released.

A. They produce hydrogen gas when reacted with metals

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That result from subduction of oceanic plates beneath lighter continental plates. most of the earth's volcanoes are located around the pacific ring of fire because that the location of most of the earth's subduction zones.