The apparatus used to test acidity of aqueous solution is :

(A) pH meter
(B) Ammmeter
(C) Hygrometer
(D) Acidmeter

Correct Answer : pH meter
Explanation : A pH meter is an electronic device used for measuring the pH (acidity or alkalinity) of a liquid. A typical pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading.
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