copper does not give hydrogen gas with hydrochloric acid
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No, HCl acid does not react with copper. Only those metals whose standard reduction potentials are lower than that ofhydrogen react with non-oxidising acidslike HCl and dil.H2SO4, and displacehydrogen from them. ... But it does react with dilute HCL in the presence of oxygen
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I don't understand
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depends on reactivity series read it you will get to know
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