Which of the following statements about the standard hydrogen electrode is not correct?
a
The hydrogen gas is at a pressure of 1 atmosphere
b
A solution containing 1 mol dm-3 of H+ (aq) ions is used
c
A platinum electrode is used
d
The temperature is kept at 20 °C
Explanation
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Josh1520
10 months ago
The statement that is **not correct** is: **D. The temperature is kept at 20 °C** 
**Explanation:**
For a **standard hydrogen electrode (SHE)**, the conditions are:
1. Hydrogen gas at **1 atmosphere** pressure
2. Acidic solution with **1 mol dm⁻³ H⁺ ions**
3. **Platinum electrode** coated with platinum black
4. Temperature maintained at **25 °C (298 K)** 
— not 20 °C.
