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predict whether zinc react with one M hydrochloric acid to give hydrogen gas or not. Give that standard reduction potential of zinc and hydrogen are -0.76 volt and 0.0 volt respectively.

predict whether zinc react with one M hydrochloric acid to give hydrogen gas or not. Give that standard reduction potential of zinc and hydrogen are -0.76 volt and 0.0 volt respectively.

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The following reaction should take place: Z n + H 2 S O 4 → Z n S O 4 + H 2

Std. EMF of the cell ( E ∘ c e l l ) = [ Std. redn. pot. of R.H.S. electrode ] − [ Std. redn. pot. of L.H.S. electrode ] = 0 − ( − 0.76 ) = + 0.76

Thus, the EMF of the cell comes out to be positive. hence, the reaction takes place.



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