17. Why does not copper react with hydrochlonc aod even on heating?
18. How will you detect the evolution of hydrogen gas in reaction between a meatal and acid?
19.Compare the appeareance of aluminum and sulphur.
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No, HCl acid does not react with copper. Only those metals whose standard reduction potentials are lower than that of hydrogen react with non-oxidising acids like HCl and dil.H2SO4, and displace hydrogen from them. Copper has higher reduction potential (more positive) than hydrogen, and it does not react with HCl acid.
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