pH meter is an example ofa) amperometric biosensorb) conductive biosensorc) potentiometric biosensord) piezo electric biosensor

To determine the correct answer regarding which type of biosensor a pH meter represents, let's analyze each option:

1. Amperometric Biosensor: This type of biosensor measures the current produced by the reaction of the analyte with a specific enzyme or biomolecule. It typically operates based on the measurement of current.

2. Conductive Biosensor: This biosensor measures changes in electrical conductivity brought about by the binding of the target analyte. While related to conductivity, it is not specific to pH measurement.

3. Potentiometric Biosensor: This type measures the voltage (potential) change in response to the concentration of an ion (such as hydrogen ions in the case of pH). A pH meter essentially measures the potentiometric output of a glass electrode that responds to pH levels.

4. Piezoelectric Biosensor: This type measures changes in frequency or mass as a result of the binding of molecules to a surface. It is not applicable to pH measurement.

Final Answer

The correct answer is c) potentiometric biosensor, as a pH meter measures the potential difference related to the concentration of hydrogen ions, which is characteristic of potentiometric sensing.