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(D) The thermal decomposition of sodium nitrate $(NaNO_3)$ occurs in stages. At temperatures above $800\,^oC$,the reaction proceeds as follows:$2NaNO_

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$Na_2O$

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(D) The thermal decomposition of sodium nitrate $(NaNO_3)$ occurs in stages. At temperatures above $800\,^oC$,the reaction proceeds as follows:$2NaNO_3 \rightarrow 2NaNO_2 + O_2$$2NaNO_2 \rightarrow Na_2O + NO + NO_2$Combining these,the final products at high temperatures include $Na_2O$,$N_2$,and $O_2$. However,the primary decomposition product at very high temperatures is $Na_2O$ along with the release of gases.

Thermal decomposition of sodium nitrate at temperatures above $800\,^oC$ yields ..........

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