Which one of the following statements relating to the glass electrode is correct?

Question

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The glass electrode is a type of ion-selective electrode used to measure the pH of a solution. It works by measuring the potential difference between the glass electrode and a reference electrode immersed in the same solution. The potential of the glass electrode varies linearly with the pH of the solution, making it a useful tool for measuring acidity or alkalinity. A and B are incorrect as the glass electrode does not detect hydrogen gas or conduct electrons. C is also incorrect as a reference electrode is required to measure pH accurately.

Which One of the Following Statements Relating to the Glass