Question:
Which one of the following nitrates does not give the corresponding metallic oxide, nitrogen dioxide and oxygen on heating?
Which one of the following nitrates does not give the corresponding metallic oxide, nitrogen dioxide and oxygen on heating?
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Alkali metal nitrates except lithium usually form nitrites on heating, not metal oxides.
Updated On: Apr 29, 2026
- Lithium nitrate
- Beryllium nitrate
- Magnesium nitrate
- Calcium nitrate
- Potassium nitrate
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The Correct Option is
Solution and Explanation
Concept:
Most metal nitrates decompose on heating to give metal oxide, nitrogen dioxide and oxygen. However, alkali metal nitrates, except lithium nitrate, give nitrites and oxygen.
Step 1: General decomposition of many nitrates.
\[ M(NO_3)_2 \rightarrow MO + NO_2 + O_2 \]
Step 2: Exception for alkali metal nitrates.
Potassium nitrate decomposes as: \[ 2KNO_3 \rightarrow 2KNO_2 + O_2 \] It does not give potassium oxide and nitrogen dioxide.
Step 3: Choose the exception.
Hence, potassium nitrate is the correct answer.
Step 1: General decomposition of many nitrates.
\[ M(NO_3)_2 \rightarrow MO + NO_2 + O_2 \]
Step 2: Exception for alkali metal nitrates.
Potassium nitrate decomposes as: \[ 2KNO_3 \rightarrow 2KNO_2 + O_2 \] It does not give potassium oxide and nitrogen dioxide.
Step 3: Choose the exception.
Hence, potassium nitrate is the correct answer.
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