alleryAccording to the chapter, which definition of oxidation is correct?
ACombining with hydrogen or losing oxygen
BCombining with oxygen or losing hydrogen
CLosing oxygen and gaining hydrogen
DGaining one or more electrons
Answer & Solution
Correct answer: B. Combining with oxygen or losing hydrogen
1. The chapter defines oxidation as a reactant combining with oxygen, e.g. 2Mg + O$_2$ $\longrightarrow$ 2MgO.
2. It also includes loss of hydrogen, e.g. removal of H$_2$ from a reactant.
3. So oxidation = gain of oxygen OR loss of hydrogen.
4. Combining with hydrogen or losing oxygen describes reduction, and gaining electrons is reduction in the electron sense, so those options are wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.51_
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