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Q.

Which of the following oxides cannot be reduced with carbon to obtain the metal?

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a

MnO2

b

Al2O3

c

None of these 

d

MNO2

answer is D.

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Detailed Solution

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  • None of the above oxides can be reduced with carbon to obtain the metal.
  • The oxides of highly reactive metals cannot be reduced by carbon. 
  • Magnesium has a very low reduction potential compared to other metal oxides, therefore conventional reducing agents cannot reduce it. 
  • The oxides of sodium, magnesium, calcium, aluminium, etc. cannot be converted to the corresponding metals by carbon. This is because certain metals have more affinity to bind oxygen than carbon.
     
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