Hello how can i solve this kind of questions
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Cu will displace only Ag out of all the given options as Ag’s the only 1 that’s less reactive than Cu.
Ca also displaces Oxygen and thus 3 is also correct.
Fe is less reactive than Ca thus the reaction won’t take place.
Answer = 1 and 3.
The answer is E
I think also Ca displace H cause its more reactive than it
I saw it as Cu 
anyway I’ve corrected. Yes you’re right I hope you got the method.