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Which of the Following Is Not a Valid XML Tag

question 1

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Which of the following is not a valid XML tag name?


Definitions:

pH

A scale used to specify the acidity or basicity of an aqueous solution, with values ranging from 0 (most acidic) to 14 (most basic).

HI

Hydroiodic acid, a diatomic molecule consisting of one hydrogen atom and one iodine atom, known for being a strong acid.

K

The chemical symbol for Potassium, a soft, silvery-white metallic element that is highly reactive with water.

pH

A scale used to specify the acidity or basicity of an aqueous solution, with values ranging from 0 (very acidic) to 14 (very basic).

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