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The selection of KNO3, KMnO4, and Na2CrO4 as examples of oxidizing agents is correct because each of these compounds is known for their ability to accept electrons during chemical reactions, facilitating oxidation in other substances.

KNO3 (potassium nitrate) is commonly used in various applications, including fertilizers and explosives, and it acts as an oxidizer by providing oxygen for combustion reactions. KMnO4 (potassium permanganate) is a strong oxidizing agent often utilized in organic chemistry for its power to convert alcohols to ketones and other functional groups. Similarly, Na2CrO4 (sodium chromate) is used in various industrial processes and can also act as an oxidizer in chemical reactions involving organic compounds.

These substances are well-recognized for their roles in redox reactions, wherein they promote the oxidation of other materials, showcasing their significance as oxidizing agents in both laboratory and industrial settings.