All acids have one of the following elements in common, and that is

Options :
  1. Carbon
  2. Hydrogen
  3. Oxygen
  4. Sulphur
Answer and Explanation :-

Answer: Option 2

Explanation:

All acids contain hydrogen. When acids are dissolved in water, hydrogen ions are released into the resulting solution. An acid is a proton donor and proton ions come in the form of H+ therefore all acids contain Hydrogen ions. You can identify acids by using litmus. An acid will turn litmus to red.

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