A) hydrogen
B) carbon
C) sulphur
D) oxygen
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The correct answer is A) hydrogen
The element common to all acids is hydrogen.
This element is found in compounds such as HCl, H2SO4, and HNO3. Hydrogen is the simplest element, as its atom contains only a single proton and a single neutron.
The number of standardized hydrogen ions accounts for the acidity of a compound, and an acidic compound donates a proton.