Question:
Which one of the following nitrates will decompose to give \(\text{NO}_{2}\) on heating ?
Which one of the following nitrates will decompose to give \(\text{NO}_{2}\) on heating ?
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Lithium nitrate decomposes to the oxide, NO2 and O2, while the other alkali metal nitrates give only nitrites and oxygen.
Updated On: Nov 12, 2026
- \(\text{NaNO}_{3}\)
- \(\text{KNO}_{3}\)
- \(\text{RbNO}_{3}\)
- \(\text{LiNO}_{3}\)
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Alkali metal nitrates usually decompose to nitrites and oxygen on heating. Lithium is the exception because of its small size and high polarising power.
Step 2: Decomposition reactions
\(2\text{NaNO}_{3}\rightarrow2\text{NaNO}_{2}+\text{O}_{2}\) (similarly for K and Rb).
\(4\text{LiNO}_{3}\rightarrow2\text{Li}_{2}\text{O}+4\text{NO}_{2}+\text{O}_{2}\).
Step 3: Result
Only lithium nitrate gives \(\text{NO}_{2}\), option (D).
Final Answer:
Lithium nitrate gives NO2 on heating. \[ \boxed{\text{(D) }\text{LiNO}_{3}} \]
Alkali metal nitrates usually decompose to nitrites and oxygen on heating. Lithium is the exception because of its small size and high polarising power.
Step 2: Decomposition reactions
\(2\text{NaNO}_{3}\rightarrow2\text{NaNO}_{2}+\text{O}_{2}\) (similarly for K and Rb).
\(4\text{LiNO}_{3}\rightarrow2\text{Li}_{2}\text{O}+4\text{NO}_{2}+\text{O}_{2}\).
Step 3: Result
Only lithium nitrate gives \(\text{NO}_{2}\), option (D).
Final Answer:
Lithium nitrate gives NO2 on heating. \[ \boxed{\text{(D) }\text{LiNO}_{3}} \]
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