which of the following pairs of nitrates gives the same gaseous products on thermal decomposition?
A
KNO3 and Pb(NO3)2
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B
KNO3 and NaNO3
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C
Pb(NO3)2 and Cu(NO3)2
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D
NaNO3 and Ca(NO3)2
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Solution
The correct options are BKNO3 and NaNO3 CPb(NO3)2 and Cu(NO3)2 On heating both KNO3 and NaNO3 give O2 as gaseous product. 2KNO3→2KNO2+O2 2NaNO3→2NaNO2+O2 while Pb(NO3)2 and Cu(NO3)2 give NO2 and O2 as gaseous products. 2Pb(NO3)2→2PbO+4NO2+O2 2Cu(NO3)2→2CuO+4NO2+O2