Paper 3 · electrochemistry
Which statement is correct about standard hydrogen electrode?
APressure of hydrogen gas is 0.1 atmospheres.
BConcentration of hydrogen ions is 1.0 .
CHydrogen ions acquire electrons from the platinum electrode.
DThe cell is at temperature of 398 K.
Explanation: The marking scheme gives answer B. Standard conditions for the hydrogen electrode require [H⁺] = 1.0 mol dm⁻³, H₂ pressure = 1 atm, and temperature = 298 K.
ZIMSEC Chemistry Paper 3, November 2009, Q11
