Which oxide will not give metal on heating?

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(B) Metals lying above $H$ in the electrochemical series are not obtained from their oxides by simple heating.On heating,$ZnO$ will not give $Zn$ meta

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$ZnO$

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(B) Metals lying above $H$ in the electrochemical series are not obtained from their oxides by simple heating.On heating,$ZnO$ will not give $Zn$ metal because $Zn$ is a moderately reactive metal.However,it can be reduced with $C$ or $H_2$ to give the free metal:$ZnO + C ightarrow Zn + CO$$ZnO + CO ightarrow Zn + CO_2$$ZnO + H_2 \xrightarrow{	ext{above } 400^{\circ} C} Zn + H_2O$In contrast,$HgO$ and $Ag_2O$ are oxides of noble metals and decompose upon heating to give $Hg$ and $Ag$ respectively:$2HgO ightarrow 2Hg + O_2$$2Ag_2O ightarrow 4Ag + O_2$

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