Q. In a reaction, what is the loss of hydrogen by substance called as?
Answer: Oxidation
Notes: Oxidation is the loss of electrons during a reaction by a molecule, atom or ion. Oxidation occurs when the oxidation state of a molecule, atom or ion is increased. The opposite process is called reduction, which occurs when there is a gain of electrons or the oxidation state of an atom, molecule, or ion decreases. Oxidation is the loss of hydrogen. Reduction is the gain of hydrogen.

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