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Which among the following does not give Nitrogen dioxide on heating?

Option: 1

\mathrm{LiNO}_3


Option: 2

\mathrm{NaNO}_3


Option: 3

\mathrm{KNO}_3


Option: 4

\mathrm{RbNO}_3


Answers (1)

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Alkali nitrate on heating decomposes to give its respective nitrite and \mathrm{O}_2. But Lithium metal is an exception for this. Lithium nitrate on heating decomposes to give lithium oxide, nitrogen dioxide and oxygen because \mathrm{Li}^{+} ion has a high polarising power which favours the formation of oxide.

4 \mathrm{LiNO}_3 \rightarrow 2 \mathrm{Li}_2 \mathrm{O}+4 \mathrm{NO}_2+\mathrm{O}_2

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Riya

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