If one of the following oxides is heated with hydrogen or carbon using a bunsen burner. it is not reduced to the metal, Which one is it?
lead oxide
Magnesium oxide
Copper oxide
Tin oxide
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@myschool You guys are doing a great job but please try to add official explanations to every question so that we can understand it better

let me explain....
The oxide that cannot be reduced to the metal when heated with hydrogen or carbon using a Bunsen burner is magnesium oxide. Magnesium oxide is an ionic compound made up of positively charged magnesium ions and negatively charged oxygen ions. When heated with hydrogen or carbon, the oxygen ions are not easily removed from the compound. This is because the ionic bond between the magnesium and oxygen ions is very strong and requires a lot of energy to break. On the other hand, lead oxide, copper oxide, and tin oxide are all metal oxides and can be reduced to the metal by heating with hydrogen or carbon. This is because they have a weaker bond between the metal and oxygen ions, allowing the oxygen to be removed more easily when heated.
pov: mr frank jr 

In the electrochemical series.
Mg, Sn and pb are all higher than Hydrogen..
There they will displace Hydrogen , react with O2, and become reduced to their metal respectively.
Cu ( copper) cannot displace Hydrogen since it is lower in the electrochemical series.
Therefore,copper cannot be reduced to its respective metal.
Please check this up

