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The nitrate of which metal does not give nitrogen dioxide on strong reacting?
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$\mathrm{Na}$
$\begin{array}{r}\mathrm{LiNO}_3 / \mathrm{Mg}\left(\mathrm{NO}_3\right)_2 / \mathrm{Ca}\left(\mathrm{NO}_3\right) \stackrel{\Delta}{\longrightarrow} \\ \mathrm{Li}_2 \mathrm{O} / \mathrm{MgO} / \mathrm{CaO}+4 \mathrm{NO}_2+\mathrm{O}_2\end{array}$
$\mathrm{NaNO}_3 \stackrel{\Delta}{\longrightarrow} \mathrm{NaNO}_2+\mathrm{O}_2$
$\mathrm{NaNO}_3 \stackrel{\Delta}{\longrightarrow} \mathrm{NaNO}_2+\mathrm{O}_2$
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