Displacement reaction

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 :smile: anyway I’ve corrected. Yes you’re right I hope you got the method.