Multiple choice

The element common to all acids is

  1. oxygen

  2. hydrogen

  3. nitrogen

  4. sulphur
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

All acids contain hydrogen ions (H+). When acids dissolve in water, they release H+ ions, which is why hydrogen is the defining element present in all acidic compounds. Oxygen is not present in all acids (e.g., HCl).

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