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Question

Nitrogen dioxide cannot be obtained by heating: 
 
  1. KNO3 
     
  2. LiNO3
  3. RbNO3
     
  4. NaNO3


Solution

The correct options are
A KNO3 
 
C RbNO3
 
D NaNO3
Alkali nitrate on heating decompose to give respective nitrite and O2. But Lithium metal is an exception for this. 
Lithium nitrate on heating decompose to give lithium oxide, nitrogen dioxide and oxygen because Li+ ion has high polarising power which favour the formation of oxide.
4LiNO32Li2O+4NO2+O2
2MNO32MNO2+O2
where, M = Na, K and Rb.
Hence, (a), (c) and (d) are correct. 
 

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