What is standard hydrogen electrode ?

Why is standard hydrogen electrode called reversible electrode?

What is the use of standard hydrogen electrode ?

What is the electrode potential of a standard hydrogen electrode ?

What is the potential of a standard hydrogen electrode ?

What is the function of platinised platinum in the standard hydrogen electrode?

The standard reduction potential of Zn^(2+)|Zn electrode is -0.76 V . What will be the electrode reactions if this electrode is coupled with a standard hydrogen electrode?

How.is standard electrode potential of zinc electrode measured by using standard hydrogen electrode?