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Of the elements Zn , Mg Cu and Ag , whi...

Of the elements Zn , Mg Cu and Ag , which are able to produce `H_(2)` gas when they are treated with dilute HCl solutions ?
[ Given `E_(Zn^(2+)|Zn)^(@)= -0.76 V , E_(Mg^(2+)|Mg)^(@) = - 1.20 V, E_(Cu^(2)+|Cu)^(@)+0.34 V and E_(Ag^(+)|Ag)^(@) = + 0.80 V `]

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A metal with a smaller standard reduction potential than hydrogen can displace `H_(2)` gas when it is heated with a dilute HCl solution . Of the given elements only Zn and Mg can displace `H_(2)` gas from a dilute HCl solution as they hve smaller standard reduction potentials compared to hydrogen
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