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Of the following, which element is common to all acids

  • A.Hydrogen
  • B.Carbon
  • C.Sulphur
  • D.Oxygen

Answer: A

Hydrogen is the element common to all acids. An acid is defined as a substance that releases hydrogen ions (H+) in water.

Hydrochloric acid gives HCl → H+ + Cl−, sulphuric acid gives two hydrogen ions, and it is the concentration of those ions that the pH scale measures.

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