Q40. What pressure (bar) of $\mathrm { H } _ { 2 }$ would be required to make emf of hydrogen electrode zero in pure water at $25 ^ { \circ } \mathrm { C }$ ? (1) $10 ^ { - 7 }$ (2) 0.5 (3) 1 (4) $10 ^ { - 14 }$
Q40. What pressure (bar) of $\mathrm { H } _ { 2 }$ would be required to make emf of hydrogen electrode zero in pure water at $25 ^ { \circ } \mathrm { C }$ ?\\
(1) $10 ^ { - 7 }$\\
(2) 0.5\\
(3) 1\\
(4) $10 ^ { - 14 }$