Question
What does the negative sign in the expression $\text{E}^\ominus_{\text{zn}^{2+}/\text{zn}}=-0.76\text{V}$ mean?
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Answer
It means that $Zn$ is more reactive than hydrogen. When zinc electrode will be connected to $\text{SHE, Zn}$ will get oxidised and $H^+$ will get reduced.
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