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Question
Hydrogen gas will reduce :
Hydrogen gas will reduce :
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Solution
The correct option is A hot cupric oxide
Hydrogen is a good reducing agent. When hydrogen is passed over many heated metallic oxides, they are reduced to the metals. Hydrogen reduces oxides of metals which are below in reactivity series. That means the hydrogen can reduce the oxides of only those metals which are less reactive than hydrogen itself. Therefore H2 can reduce only oxides of CuO, according to reactivity series Fe2O3, SnO2, and Al2O3 are oxides of more reactive metals than hydrogen. They would not be reduced by it.
Hydrogen is a good reducing agent. When hydrogen is passed over many heated metallic oxides, they are reduced to the metals. Hydrogen reduces oxides of metals which are below in reactivity series. That means the hydrogen can reduce the oxides of only those metals which are less reactive than hydrogen itself. Therefore H2 can reduce only oxides of CuO, according to reactivity series Fe2O3, SnO2, and Al2O3 are oxides of more reactive metals than hydrogen. They would not be reduced by it.
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