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Acid fundamentals (core element): Which chemical element is common to all acids? Think of the ion released by acids in aqueous solution per Arrhenius/Brønsted concepts. Choose the correct element.

Difficulty: Easy

Hydrogen
Oxygen
Nitrogen
Chlorine

Correct Answer: Hydrogen

Explanation:

What is being asked?
The element present in all acids.

Given data

Definition: Acids donate H⁺ (Arrhenius/Brønsted)

Concept/Approach
All acids contain hydrogen because acidity arises from the ability to donate a proton (H⁺), e.g., HCl, H₂SO₄, CH₃COOH.

Final Answer
Hydrogen

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