KCET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)
Which one of the following nitrate will decompose to give \(\mathrm{NO}_2\) on heating ?
- A \(\mathrm{NaNO}_3\)
- B \(\mathrm{KNO}_3\)
- C \(\mathrm{RbNO}_3\)
- D \(\mathrm{LiNO}_3\)
Answer & Solution
Correct Answer
(D) \(\mathrm{LiNO}_3\)
Step-by-step Solution
Detailed explanation
Among the given nitrates, only \(\mathrm{LiNO}_3\) will give \(\mathrm{NO}_2\) on heating. While all other nitrates will give oxygen.
i.e. \(\mathrm{LiNO}_3 \xrightarrow{\Delta} 2 \mathrm{Li}_2 \mathrm{O}+4 \mathrm{NO}_2+\mathrm{O}_2\)
\(2 \mathrm{MNO}_3 \xrightarrow{\Delta} 2 \mathrm{MNO}_2+\mathrm{O}_2\)
(where, \(M=\mathrm{Na}, \mathrm{K}, \mathrm{Rb}\) )
i.e. \(\mathrm{LiNO}_3 \xrightarrow{\Delta} 2 \mathrm{Li}_2 \mathrm{O}+4 \mathrm{NO}_2+\mathrm{O}_2\)
\(2 \mathrm{MNO}_3 \xrightarrow{\Delta} 2 \mathrm{MNO}_2+\mathrm{O}_2\)
(where, \(M=\mathrm{Na}, \mathrm{K}, \mathrm{Rb}\) )
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