The oxide which is not reduced by hydrogen is

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(B) The reduction of metal oxides by hydrogen depends on the position of the metal in the electrochemical series. Metals that are more electropositive

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$K_2O$

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(B) The reduction of metal oxides by hydrogen depends on the position of the metal in the electrochemical series. Metals that are more electropositive than hydrogen (i.e.,have a more negative standard reduction potential) cannot be reduced by hydrogen. Potassium $(K)$ is a highly reactive metal with a very negative reduction potential,so $K_2O$ cannot be reduced by hydrogen. Conversely,oxides of metals like $Ag$ and $Fe$ can be reduced by hydrogen because they are less electropositive than hydrogen.

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