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What is the full form of 'HCl'?

  1. High chloride

  2. Hydrochloric acid

  3. Heavy calcium

  4. Hemoglobin count

The correct answer is: Hydrochloric acid

HCl stands for hydrochloric acid. High chloride (A) and heavy calcium (C) are not the correct full forms of HCl and do not accurately represent the compound. Although they contain the letters H and Cl, they do not accurately describe the full composition of HCl. Hemoglobin count (D) is also an unrelated term and does not refer to the compound HCl at all. Therefore, the best answer is hydrochloric acid, as it accurately describes the chemical composition of HCl.